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 PDFInfo
- 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
- Authority
- US
- United States
- Prior art keywords
- pressure
- process according
- iaddend
- iadd
- atmospheres
- 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 - Fee Related
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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
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.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Devices For Molds (AREA)
- Mold Materials And Core Materials (AREA)
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 (de) |
EP (1) | EP0096045A1 (de) |
JP (1) | JPS58502090A (de) |
AU (1) | AU1013183A (de) |
CA (1) | CA1217620A (de) |
DD (1) | DD208311B5 (de) |
DE (1) | DE3149172A1 (de) |
DK (1) | DK364983A (de) |
IT (1) | IT1191115B (de) |
WO (1) | WO1983002078A1 (de) |
ZA (1) | ZA829066B (de) |
Cited By (1)
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)
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 (de) * | 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. |
CN100397899C (zh) | 2000-10-11 | 2008-06-25 | 联合视频制品公司 | 提供数据存储到点播媒体传递系统中服务器上的系统和方法 |
Citations (13)
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 (de) * | 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)
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 (en) * | 1981-04-02 | 1982-10-14 | Koebel Alfons | Method and device for pneumatically compacting molding sand |
-
1981
- 1981-12-11 DE DE19813149172 patent/DE3149172A1/de not_active Ceased
-
1982
- 1982-12-06 IT IT24627/82A patent/IT1191115B/it active
- 1982-12-08 DD DD24571082A patent/DD208311B5/de not_active IP Right Cessation
- 1982-12-09 ZA ZA829066A patent/ZA829066B/xx unknown
- 1982-12-09 US US06/880,721 patent/USRE32622E/en not_active Expired - Fee Related
- 1982-12-09 EP EP82903449A patent/EP0096045A1/de not_active Withdrawn
- 1982-12-09 US US06/531,827 patent/US4546810A/en not_active Ceased
- 1982-12-09 JP JP82503576A patent/JPS58502090A/ja active Pending
- 1982-12-09 WO PCT/CH1982/000131 patent/WO1983002078A1/en unknown
- 1982-12-09 AU AU10131/83A patent/AU1013183A/en not_active Abandoned
- 1982-12-10 CA CA000417439A patent/CA1217620A/en not_active Expired
-
1983
- 1983-08-10 DK DK364983A patent/DK364983A/da not_active Application Discontinuation
Patent Citations (13)
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 (de) * | 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)
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)
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 |
---|---|
DD208311A5 (de) | 1984-05-02 |
ZA829066B (en) | 1983-09-28 |
JPS58502090A (ja) | 1983-12-08 |
DE3149172A1 (de) | 1983-06-30 |
WO1983002078A1 (en) | 1983-06-23 |
DK364983D0 (da) | 1983-08-10 |
IT8224627A0 (it) | 1982-12-06 |
IT1191115B (it) | 1988-02-24 |
CA1217620A (en) | 1987-02-10 |
IT8224627A1 (it) | 1984-06-06 |
EP0096045A1 (de) | 1983-12-21 |
AU1013183A (en) | 1983-06-30 |
DK364983A (da) | 1983-08-10 |
DD208311B5 (de) | 1994-08-25 |
US4546810A (en) | 1985-10-15 |
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