US3802484A - Apparatus for producing foundry cores - Google Patents

Apparatus for producing foundry cores Download PDF

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Publication number
US3802484A
US3802484A US00281014A US28101472A US3802484A US 3802484 A US3802484 A US 3802484A US 00281014 A US00281014 A US 00281014A US 28101472 A US28101472 A US 28101472A US 3802484 A US3802484 A US 3802484A
Authority
US
United States
Prior art keywords
core
gate
proportioning chamber
outlet port
mixer
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
US00281014A
Other languages
English (en)
Inventor
I Tsvetkov
E Stolyar
A Ovodov
V Kuteinkov
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.)
Individual
Original Assignee
Individual
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
Priority to DE19722239057 priority Critical patent/DE2239057C3/de
Priority claimed from DE19722239057 external-priority patent/DE2239057C3/de
Priority to GB3664873A priority patent/GB1363602A/en
Priority to GB3808472A priority patent/GB1363601A/en
Application filed by Individual filed Critical Individual
Priority to US00281014A priority patent/US3802484A/en
Priority to FR7230788A priority patent/FR2197674B1/fr
Application granted granted Critical
Publication of US3802484A publication Critical patent/US3802484A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/02—Compacting by pressing devices only
    • B22C15/08—Compacting by pressing devices only involving pneumatic or hydraulic mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C13/00—Moulding machines for making moulds or cores of particular shapes
    • B22C13/12—Moulding machines for making moulds or cores of particular shapes for cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/10—Compacting by jarring devices only
    • B22C15/14—Compacting by jarring devices only involving pneumatic or hydraulic mechanisms
    • B22C15/16—Compacting by jarring devices only involving pneumatic or hydraulic mechanisms the machine having special provision for reducing shock to its frame
    • B22C15/18—Compacting by jarring devices only involving pneumatic or hydraulic mechanisms the machine having special provision for reducing shock to its frame by means of separate shock-absorbers
    • 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
    • B22C5/08—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sprinkling, cooling, or drying
    • 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
    • B22C5/18—Plants for preparing mould materials

Definitions

  • a piston located in a proportioning chamber of an apparatus is of a telescopic type, each piston stage having an individual drive; abutting upon an outlet port of the proportioning chamber is a gate rigid with a shaped nozzle mounted to reciprocate in such a manner that it closes the outlet port of the proportioning chamber alternatively with the gate; the shaped nozzle is detachable; the apparatus is furnished with a gear adapted to return mixture leftovers from the nozzle to a mixer to be recovered therein.
  • a disadvantage of. the known methods of producing cores consists in inadequate filling of the core boxes having intricate contours and a branched working surface with the core sand. Usually such boxes cannot be filled through core print holes and in this case the core must be either blown through additional holes in the working surface of the box or be made up of two or more pieces which are subsequently glued together. in both cases lower surface quality as well as lower accuracy of the cores and an increase in labour, input become indispensible.
  • the core-blowing-andshooting method is employed for the production of relatively small-size cores (their maximum size being 0.6-0.7 m.) in the hot boxes.
  • their quality gets appreciably worse, which is attributable to a sharp reduction in a compacting force which occurs as the sand mixture migrates from the axis of blow holes.
  • the basic object of the invention is to provide a method of producing foundry cores made from fluid sand mixtures and featuring good geometrical accuracy, high-quality surface and high strength properties.
  • the pressure of the fluid sand mixture within the core box it can be maintained between 3 to 20 kg/cm for 5 to 30 seconds, which shall be followed by a gradial increase in the pressure up to 40 kg/cm within the next 5-60 seconds.
  • an apparatus comprising hoppers for raw materials connected with a mixer from which the fluid sand mixture produced therein under the action through the proportioning chamber and a shaped nozzle abutting upon the chamber and fittedwith a gate into a core box, the piston being made, according to the invention of a telescopic type, each piston stage being provided with an individual drive, the core box is furnished with a sealing means, the nozzle is rigid with the gate and both of them are mounted to reciprocate so that the cover alternately the outlet port of the proportioning chamber, the apparatus being also fitted with a gear adapted to return mixture leftovers from the nozzle, which is madedetachable to the mixer.
  • FIG. l is a longitudinal sectional view of an apparatus according to the invention.
  • FIG. 2' shows the nozzle of the apparatus in the extended position.
  • the aforesaid apparatus comprises a sand hopper 1 (FIG. 1) and a vessel (not shown in the drawing) for a fluid composition (comprising binders and a foaming agent) from which it is delivered by a pump 2 into a continuous mixer 4 via a pipeline 3.
  • the hopper 1 communicates also with the mixer 4by means a belt weighfeeder 5.
  • the mixer incorporates two shafts 6 rotating one clockwise and the other-one-counterclockwise and carrying blades 7 mounted along a helix.
  • the shafts 6 of the mixer 4 receive rotation from an electric motor 8.
  • In the face-end of the mixer 4 there is an outlet 9 closed by a gate 10.
  • a cylindrical proportioning chamber 1 l which incorporates a piston 12 coupled to a pneumo-hydraulic drive 13 controlled by a slide 14.
  • the piston 12 is of an extensible (telescopic) type, each stage being provided with an individual drive.
  • Abutting upon the outlet port of the proportioning chamber 11 is a gate 15 mounting a shaped nozzle 16 (FIG. 2) set up flush with the gate surface facing the proportioning chamber 11. As to the nozzle shape, it may be made, for instance, in the form of a cone. Both the gate 15 and nozzle 16 are con- 1 a way that its core print hole 20 is strictly opposite the outlet port of the proportioning chamber 11.
  • To provide sealing of the core box 19 it is furnished with a gate 21 operated by a drive 22.
  • the apparatus is furnished with a gear 23 adapted to return mixture leftovers to the mixer 4 from the nozzle 16 after the core box 19 has been filled with the sand mixture.
  • the returning gear 23 can be made in the form of an elevator,
  • the above apparatus functions in the following manner.
  • Sand is continuously fed into a mixer 4 from a hopper 1 (FlG.1) by a belt weigh-feeder 5.
  • a liquid composition is delivered to the mixer 4 by a pump 2 via a pipeline 3.
  • a pump 2 As the mixture is being stirred and advanced along the mixer 4, it passes into a fluid state and fills a proportioning chamber 11 through an outlet 9.
  • a preheated core box 19 is mounted on a lifting platform 18, the proportioning chamber 1 1 is completely filled with the fluid sand mixture.
  • the core box 19 is so disposed on the lifting platform 18 that its print hole is arranged strictly opposite the outlet port of the proportioning chamber.
  • a gate closes the outlet 9
  • a drive 17 adapted for traversing a nozzle 16 and a gate 15 is actuated, the nozzle 16 coincides with the outlet port of the proportioning chamber 11.
  • the lifting platform 18 forces the core box 19 against the nozzle 16
  • a pneumo-hydraulic drive 13 of a piston 12 is actuated with the aid of a slide 14.
  • the fluid sand mixture is forced out of the proportioning chamber 11, filling up the core box 19.
  • a pressure of 3 kg/cm is created within the core box 19, being applied to the fluid sand mixture for 5 seconds and it is under the influence of this pressure that a solid skin 1 mm. thick is formed on the surface of the core during this length of time.
  • a drive 22 of a gate 21 is actuated, the core box 19 being sealed at this. Upon sealing the pressure within the core box 19 is maintained constant, the skin thickness being increased thereby up to 3 mm.
  • the initial pressure acting on the fluid sand mixture is specified to be equal to 40 kg/cm a solid core skin up to 25 mm. thick is attainable.
  • a stepwise rise in pressure at first a 5-kg/cm pressure is being maintained for 5 seconds, whereafter the slide actuates the second stage of the piston 12.
  • the pressure within the core box rises to 10 kg/cm and is kept at this level for another 5 seconds.
  • the piston 12 can be built-up of more than two stages, if required by the process, this being stipulated by core contours and size). Over this period of time the thick skin is being formed on the core surface.
  • the skin thickness which is a function of the pressure within the core box 19 and mixture holding time under this pressure, ranges from 1 to 25 mm.
  • the reciprocating drive 17 displaces the nozzle 16 to its extreme right-hand position with respect to the proportioning chamber 11, the chamber outlet port (not shown in the drawing) being closed by the gate 15.
  • the nozzle 16 (FIG. 2) being open, mixture leftovers, which have lost their flowability under high pressure, are fed by the gear 23 from the nozzle 16 to the mixer for recovery.
  • the fluid sand mixture is being accumulated in the mixer 4.
  • the gate 10 opens, the fluid sand mixture is again admitted into the proportioning chamber 11 through the outlet 9 to fill it up. Further the operational sequence of the apparatus devices and gears is repeated.
  • the thickness of the strong core skin will increase to 25 mm.
  • the use of the above method and apparatus for producing foundry cores will offer a substantial reduction in the labour input required by the production process, an increase in labour productivity'along with high accuracy and enhanced quality of the cores and castings.
  • An apparatus for the production of foundry cores comprising hoppers for raw materials
  • a mixer connected with said hoppers and adapted for producing a fluid sand mixture from said raw materials
  • a proportioning chamber is communication with said mixer
  • a piston arranged in said proportioning chamber being of a telescopic type and having an individual drive for each stage; a gate abutting upon the outlet port of said proportioning chamber;
  • a shaped nozzle which is detachable, rigid with said gate and mounted to reciprocate in such a manner that it closes alternately with the gate the outlet port of the said proportioning chamber;

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Casting Devices For Molds (AREA)
  • Mold Materials And Core Materials (AREA)
US00281014A 1972-08-08 1972-08-16 Apparatus for producing foundry cores Expired - Lifetime US3802484A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE19722239057 DE2239057C3 (de) 1972-08-08 Verfahren und Vorrichtung zum Herstellen von Formkernen
GB3664873A GB1363602A (en) 1972-08-08 1972-08-15 Izatsia rosorgtekhstrom production of foundry cores
GB3808472A GB1363601A (en) 1972-08-08 1972-08-15 Production of foundry cores
US00281014A US3802484A (en) 1972-08-08 1972-08-16 Apparatus for producing foundry cores
FR7230788A FR2197674B1 (enExample) 1972-08-08 1972-08-30

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19722239057 DE2239057C3 (de) 1972-08-08 Verfahren und Vorrichtung zum Herstellen von Formkernen
GB3664873A GB1363602A (en) 1972-08-08 1972-08-15 Izatsia rosorgtekhstrom production of foundry cores
GB3808472A GB1363601A (en) 1972-08-08 1972-08-15 Production of foundry cores
US00281014A US3802484A (en) 1972-08-08 1972-08-16 Apparatus for producing foundry cores
FR7230788A FR2197674B1 (enExample) 1972-08-08 1972-08-30

Publications (1)

Publication Number Publication Date
US3802484A true US3802484A (en) 1974-04-09

Family

ID=27510264

Family Applications (1)

Application Number Title Priority Date Filing Date
US00281014A Expired - Lifetime US3802484A (en) 1972-08-08 1972-08-16 Apparatus for producing foundry cores

Country Status (3)

Country Link
US (1) US3802484A (enExample)
FR (1) FR2197674B1 (enExample)
GB (2) GB1363601A (enExample)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4241779A (en) * 1979-08-07 1980-12-30 Abramova Zinaida A Apparatus for manufacturing foundry cores
US4308909A (en) * 1979-08-24 1982-01-05 Zitser Vitaly A Apparatus for manufacturing foundry cores
DE3118956A1 (de) * 1980-05-16 1982-02-04 Central'noe proektno-konstruktorskoe i technologičeskoe bjuro Anlage zur herstellung von kernen aus fliessfaehigen formstoffen in beheizten formkaesten
DE3127784A1 (de) * 1980-07-15 1982-05-27 Central'noe proektno-konstruktorskoe i technologičeskoe bjuro Kernaustragvorrichtung
DE3149228C1 (de) * 1981-12-11 1983-10-13 Central'noe proektno-konstruktorskoe i technologičeskoe bjuro CPKTBLEGPROM Anlage zur Herstellung von Kernen aus fließfähigen Formstoffen in beheizten Mehrfachkernkästen
US4445564A (en) * 1981-11-10 1984-05-01 Tsentralnoe Proektno-Konstruktorskoe I Tekhnologicheskoe Bjuro Machine for making mould cores from flowable core sand mixtures in hot multiple core boxes
US5365995A (en) * 1993-12-27 1994-11-22 Ford Motor Company Method of curing hot box sand cores
WO1996012580A1 (en) * 1994-10-19 1996-05-02 Brunswick Industrial Inc. Aerator assembly for vertical filling of molding machines
CN104785758A (zh) * 2015-04-27 2015-07-22 海安铸鑫金属制品有限公司 铝青铜复合铸造阀板的制备方法

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1188769B (it) * 1978-05-04 1988-01-28 Ts Pk I T Bjuro Glavantekh Impianto per la fabbricazione di anime da fonderia
CH647433A5 (en) * 1979-04-13 1985-01-31 Vnii Litejnogo Mash Apparatus for the production of casting moulds and mould cores from flowable mould materials
FR2516818A1 (fr) * 1981-11-25 1983-05-27 Ts P Konstruktor Installation pour la fabrication de noyaux a partir de melanges fluides en boites chaudes a empreintes multiples
FR2547219B1 (fr) * 1983-06-07 1985-09-06 Ts P Konstruktor Installation pour la fabrication de noyaux de fonderie a partir de sables fluides dans des boites chauffees
CN106270413B (zh) * 2016-08-31 2018-12-07 西安鑫龙机械铸造有限公司 一种用于制作覆膜砂芯的装置及其使用方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR640842A (fr) * 1927-02-22 1928-07-23 Dispositif de creuset formant nourrice pour moulage sous pression
US1717325A (en) * 1925-04-17 1929-06-11 Cleveland Trust Co Method of and means for making reenforced cores of molds
US2905988A (en) * 1953-12-07 1959-09-29 Sutter Products Company Machine for automatically making sand cores
US3590906A (en) * 1968-02-16 1971-07-06 British Leyland Austin Morris Cold-box resin-bonded foundry core-making machine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2798266A (en) * 1953-08-03 1957-07-09 Fed Foundry Supply Co Core and mold blowing method and apparatus
GB754205A (en) * 1953-11-05 1956-08-01 Polygram Casting Company Ltd Improvements in or relating to methods of and apparatus for making shell moulds

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1717325A (en) * 1925-04-17 1929-06-11 Cleveland Trust Co Method of and means for making reenforced cores of molds
FR640842A (fr) * 1927-02-22 1928-07-23 Dispositif de creuset formant nourrice pour moulage sous pression
US2905988A (en) * 1953-12-07 1959-09-29 Sutter Products Company Machine for automatically making sand cores
US3590906A (en) * 1968-02-16 1971-07-06 British Leyland Austin Morris Cold-box resin-bonded foundry core-making machine

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4241779A (en) * 1979-08-07 1980-12-30 Abramova Zinaida A Apparatus for manufacturing foundry cores
US4308909A (en) * 1979-08-24 1982-01-05 Zitser Vitaly A Apparatus for manufacturing foundry cores
DE3118956A1 (de) * 1980-05-16 1982-02-04 Central'noe proektno-konstruktorskoe i technologičeskoe bjuro Anlage zur herstellung von kernen aus fliessfaehigen formstoffen in beheizten formkaesten
US4452295A (en) * 1980-05-16 1984-06-05 Tsentralnoe Proektnokonstruktorskoe I Tekhnologicheskoe Bjuro Glavsantekhprom Apparatus for production of cores from fluidized sands in hot boxes
DE3127784A1 (de) * 1980-07-15 1982-05-27 Central'noe proektno-konstruktorskoe i technologičeskoe bjuro Kernaustragvorrichtung
US4445564A (en) * 1981-11-10 1984-05-01 Tsentralnoe Proektno-Konstruktorskoe I Tekhnologicheskoe Bjuro Machine for making mould cores from flowable core sand mixtures in hot multiple core boxes
DE3149228C1 (de) * 1981-12-11 1983-10-13 Central'noe proektno-konstruktorskoe i technologičeskoe bjuro CPKTBLEGPROM Anlage zur Herstellung von Kernen aus fließfähigen Formstoffen in beheizten Mehrfachkernkästen
US5365995A (en) * 1993-12-27 1994-11-22 Ford Motor Company Method of curing hot box sand cores
WO1996012580A1 (en) * 1994-10-19 1996-05-02 Brunswick Industrial Inc. Aerator assembly for vertical filling of molding machines
US5857513A (en) * 1994-10-19 1999-01-12 Brunswick Industrial Inc. Aerator for vertical flaskless molding machine
CN104785758A (zh) * 2015-04-27 2015-07-22 海安铸鑫金属制品有限公司 铝青铜复合铸造阀板的制备方法

Also Published As

Publication number Publication date
GB1363601A (en) 1974-08-14
DE2239057A1 (de) 1974-02-21
FR2197674A1 (enExample) 1974-03-29
FR2197674B1 (enExample) 1976-08-20
DE2239057B2 (de) 1975-06-12
GB1363602A (en) 1974-08-14

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