USRE32622E - Method for the manufacture of molds using casting sand or another mixture of raw material particles - Google Patents

Method for the manufacture of molds using casting sand or another mixture of raw material particles Download PDF

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Publication number
USRE32622E
USRE32622E US06/880,721 US88072186A USRE32622E US RE32622 E USRE32622 E US RE32622E US 88072186 A US88072186 A US 88072186A US RE32622 E USRE32622 E US RE32622E
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United States
Prior art keywords
pressure
process according
iaddend
iadd
atmospheres
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Expired - Fee Related
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US06/880,721
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English (en)
Inventor
Christoph Landolt
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George Fischer Foundry Systems Inc
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George Fischer Foundry Systems Inc
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor

Definitions

  • the present invention relates to a method of manufacturing molds from casting sand or from an otherwise moldable mixture by the use of a pressure surge wave in a closed chamber.
  • the other moldable mixture comprises particles of raw material, binder, water, and, if need be, additives.
  • a number of processes are known whereby the manufacturing of molds is effected by means of a pressure surge wave.
  • a gas pressure is built up over a moldable mixture such as, for example, a casting sand, and then subsequently decreased.
  • the object of the invention is to select a range in pressure variation within which an optimal compaction of the moldable mixture is assured.
  • castings are made from casting sand or other moldable mixture by means of a pressure surge wave.
  • the pressure surge wave is characterized by four parameters: these are the increasing pressure gradient, the maximum pressure, the duration of the maximum pressure, and the decreasing pressure gradient.
  • the rise in pressure takes place with an increasing pressure gradient, dp/dt, of at least about 50 atmospheres (absolute)/second.
  • a .[.maximum.]. pressure of at least about 2 atmospheres (absolute) is maintained for at least 0.01 seconds.
  • the pressure drop takes place with a decreasing pressure gradient, -dp/dt, of up to 2.0 atmospheres (absolute)/sec.
  • the FIGURE shows four pressure surge waves as a function of time, in accordance with an illustrative embodiment of the invention.
  • the pressure range is characterized bythe fact that the moldable mixture is exposed to a gas pressure of at least 2 atmospheres (absolute) using an increasing pressure gradient, dp/dt, of at least 50 atmospheres (absolute)/second, maintaining at least this pressure for at least 0.01 seconds and then allowing the pressure to drop back to normal pressure within at least 0.2 seconds from the onset of the pressure increase.
  • the pressure surge wave should be applied to the surface of the sand as a mass flow through change of the amount of air per unit time.
  • the pressure surge may be produced by compressing a gas or by an exothermic reaction of an explosive gas mixture.
  • the pressure surge wave should be reduced to a low final pressure, that is, finally reduced to normal pressure.
  • a pressure maximum of 4 to 5.5 atmospheres (absolute) in a combustion chamber represents an optimization between the desired strength properties of the sand molds and the cost of sealing the combustion chamber. .[.The maximum.]. .Iadd.An elevated .Iaddend.pressure .Iadd.of at least 2 atmospheres (absolute) .Iaddend.should be maintained for at least 0.01 second and may be .[.mainted.]. .Iadd.maintained .Iaddend.for about 0.03-0.05 seconds.
  • the FIGURE shows four pressure surges, all of which are characterized by increasing pressure gradients, maximum pressures, duration of maximum pressure, and decreasing pressure gradients in the aforementioned ranges in accordance with the present invention.
  • Each of the surges starts at normal, i.e. atmospheric pressure and ends at normal, i.e. atmospheric pressure.
  • Compactibility relates to the decrease in volume of the casting mixture after the pressure surge is applied thereto.
  • the process described finds an application in the precise molding of a casting mold by using a pattern wherein the derived optimum values are so adjusted and combined that a pressure of 80 to 180 Newtons/centimeter 2 is produced on the surface of the pattern.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Mold Materials And Core Materials (AREA)
US06/880,721 1981-12-11 1982-12-09 Method for the manufacture of molds using casting sand or another mixture of raw material particles Expired - Fee Related USRE32622E (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813149172 DE3149172A1 (de) 1981-12-11 1981-12-11 "verfahren zur herstellung von formkoerpern mittels gasdruck"
DE3149172 1981-12-11

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US06531827 Reissue 1982-12-09

Publications (1)

Publication Number Publication Date
USRE32622E true USRE32622E (en) 1988-03-15

Family

ID=6148519

Family Applications (2)

Application Number Title Priority Date Filing Date
US06/880,721 Expired - Fee Related USRE32622E (en) 1981-12-11 1982-12-09 Method for the manufacture of molds using casting sand or another mixture of raw material particles
US06/531,827 Ceased US4546810A (en) 1981-12-11 1982-12-09 Method for the manufacture of molds using casting sand or another mixture of raw material particles

Family Applications After (1)

Application Number Title Priority Date Filing Date
US06/531,827 Ceased US4546810A (en) 1981-12-11 1982-12-09 Method for the manufacture of molds using casting sand or another mixture of raw material particles

Country Status (11)

Country Link
US (2) USRE32622E (da)
EP (1) EP0096045A1 (da)
JP (1) JPS58502090A (da)
AU (1) AU1013183A (da)
CA (1) CA1217620A (da)
DD (1) DD208311B5 (da)
DE (1) DE3149172A1 (da)
DK (1) DK364983D0 (da)
IT (1) IT1191115B (da)
WO (1) WO1983002078A1 (da)
ZA (1) ZA829066B (da)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5020582A (en) * 1988-10-29 1991-06-04 Bmd Badische Maschinenfabrik Durlach Gmbh Method and apparatus for compacting foundry molding material in a foundry mold

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3344520A1 (de) * 1983-12-09 1985-06-20 BMD Badische Maschinenfabrik Durlach GmbH, 7500 Karlsruhe Vorrichtung zum verdichten von giesserei-formstoff mittels druckgas
CH666636A5 (de) * 1984-01-09 1988-08-15 Fischer Ag Georg Verfahren zum verdichten von koernigen formstoffen.
CH672270A5 (da) * 1986-12-17 1989-11-15 Fischer Ag Georg
US5202837A (en) * 1990-07-12 1993-04-13 Coe Carlos J Material consolidation modeling and control system
US5136497A (en) * 1990-07-12 1992-08-04 Bdm International, Inc. Material consolidation modeling and control system
CH686412A5 (de) * 1992-03-10 1996-03-29 Fischer Georg Giessereianlagen Verfahren zum Verdichten von Formsand fuer Giessformen.
KR20130066712A (ko) 2000-10-11 2013-06-20 유나이티드 비디오 프로퍼티즈, 인크. 매체 콘텐츠 배달 시스템 및 방법

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2847736A (en) * 1954-12-31 1958-08-19 Pulvermacher Dietrich Device for making sand molds for metal casting
US3170202A (en) * 1962-08-22 1965-02-23 Sr William J Huston Foundry process
US3659642A (en) * 1969-12-05 1972-05-02 Lev Fedorovich Vasilkovsky Apparatus for compacting a moulding mixture
FR2141235A5 (da) * 1971-06-08 1973-01-19 Dynamit Nobel Ag
DE2249244A1 (de) * 1972-10-07 1974-04-11 Buderus Eisenwerk Verfahren zum gleichzeitigen verdichten und aushaerten von haertbaren formstoffen
DE2844464B1 (de) * 1978-10-12 1980-04-24 Eugen Dipl-Ing Buehler Verfahren und Vorrichtung zum Verdichten von Giessformen
JPS55133847A (en) * 1979-04-05 1980-10-18 Sintokogio Ltd Molding method of mold and device thereof
JPS55141355A (en) * 1979-04-19 1980-11-05 Sintokogio Ltd Mold molding method and its device
JPS55147462A (en) * 1979-05-08 1980-11-17 Sintokogio Ltd Molding method of lower mold and squeeze plate device
US4289194A (en) * 1979-04-11 1981-09-15 Sintokogio Ltd. Molding machine
US4306609A (en) * 1978-12-15 1981-12-22 Georg Fischer Aktiengesellschaft Method and apparatus for packing granular materials
US4415015A (en) * 1979-02-02 1983-11-15 George Fischer, Ltd. Process of compacting moulding sand
US4483383A (en) * 1980-11-06 1984-11-20 George Fischer Ltd. Process for compacting granular materials

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH640757A5 (de) * 1979-04-04 1984-01-31 Fischer Ag Georg Verfahren und einrichtung zum verdichten von formstoffen.
WO1982003348A1 (fr) * 1981-04-02 1982-10-14 Koebel Alfons Procede et dispositif de compactage pneumatique de sable de moulage

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2847736A (en) * 1954-12-31 1958-08-19 Pulvermacher Dietrich Device for making sand molds for metal casting
US3170202A (en) * 1962-08-22 1965-02-23 Sr William J Huston Foundry process
US3659642A (en) * 1969-12-05 1972-05-02 Lev Fedorovich Vasilkovsky Apparatus for compacting a moulding mixture
FR2141235A5 (da) * 1971-06-08 1973-01-19 Dynamit Nobel Ag
DE2249244A1 (de) * 1972-10-07 1974-04-11 Buderus Eisenwerk Verfahren zum gleichzeitigen verdichten und aushaerten von haertbaren formstoffen
DE2844464B1 (de) * 1978-10-12 1980-04-24 Eugen Dipl-Ing Buehler Verfahren und Vorrichtung zum Verdichten von Giessformen
US4306609A (en) * 1978-12-15 1981-12-22 Georg Fischer Aktiengesellschaft Method and apparatus for packing granular materials
US4415015A (en) * 1979-02-02 1983-11-15 George Fischer, Ltd. Process of compacting moulding sand
JPS55133847A (en) * 1979-04-05 1980-10-18 Sintokogio Ltd Molding method of mold and device thereof
US4289194A (en) * 1979-04-11 1981-09-15 Sintokogio Ltd. Molding machine
JPS55141355A (en) * 1979-04-19 1980-11-05 Sintokogio Ltd Mold molding method and its device
JPS55147462A (en) * 1979-05-08 1980-11-17 Sintokogio Ltd Molding method of lower mold and squeeze plate device
US4483383A (en) * 1980-11-06 1984-11-20 George Fischer Ltd. Process for compacting granular materials

Non-Patent Citations (6)

* Cited by examiner, † Cited by third party
Title
Grakov et al., "Explosive Mold Compacting", 4, Russian Castings Production (1968).
Grakov et al., Explosive Mold Compacting , 4, Russian Castings Production (1968). *
J rn New Impact Molding Method for the Compaction of Clay Bonded Molding Materials , 68, Giesserei (Sep. 28, 1981). *
Jorn "New Impact Molding Method for the Compaction of Clay Bonded Molding Materials", 68, Giesserei (Sep. 28, 1981).
The Impact Moulding Process A Promising New Development , 67, Giesserei (1980). *
The Impact Moulding Process-A Promising New Development", 67, Giesserei (1980).

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5020582A (en) * 1988-10-29 1991-06-04 Bmd Badische Maschinenfabrik Durlach Gmbh Method and apparatus for compacting foundry molding material in a foundry mold

Also Published As

Publication number Publication date
IT1191115B (it) 1988-02-24
JPS58502090A (ja) 1983-12-08
ZA829066B (en) 1983-09-28
IT8224627A0 (it) 1982-12-06
IT8224627A1 (it) 1984-06-06
AU1013183A (en) 1983-06-30
WO1983002078A1 (fr) 1983-06-23
DE3149172A1 (de) 1983-06-30
EP0096045A1 (de) 1983-12-21
DD208311B5 (de) 1994-08-25
CA1217620A (en) 1987-02-10
DK364983A (da) 1983-08-10
US4546810A (en) 1985-10-15
DD208311A5 (de) 1984-05-02
DK364983D0 (da) 1983-08-10

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