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
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- 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
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 20
- 239000002245 particle Substances 0.000 title claims abstract description 16
- 238000005266 casting Methods 0.000 title claims abstract description 14
- 239000002994 raw material Substances 0.000 title claims abstract description 14
- 239000004576 sand Substances 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims description 33
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 230000003247 decreasing effect Effects 0.000 claims abstract description 8
- 239000011230 binding agent Substances 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000002360 explosive Substances 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 230000000977 initiatory effect Effects 0.000 claims 2
- 239000000654 additive Substances 0.000 abstract description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000005056 compaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
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)
Abstract
In order to make casting sand or another moldable mixture, a pressure surge wave is used which has upper and lower limit values which values have been established by an optimal selection of a pattern of pressures. The other moldable mixture comprises particles of raw material, binder, water, and, if need be, additives. The rise in pressure takes place with an increasing pressure gradient, dp/dt, of at least 50 atmospheres (absolute)/second. A minimum pressure of at least 2 atmospheres (absolute) is maintained for at least 0.01 second. The pressure drop takes place at a decreasing pressure gradient,--dp/dt, of up to about 2.0 atmospheres (absolute)/second. The disclosed values represent an optimalization, in view of a simple design and economy of operation, with a surprisingly good compacting.
Description
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. In such processes, 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.
In accordance with the present invention, 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. These values yield surprisingly good compacting of the casting sand and or other moldable mixture from which the castings are made.
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.
Theoretically, no upper limit is set for the pressure-rise gradient.
Several tests have shown that an increasing pressure gradient of about 600 atmospheres (absolute)/second is a value which represents a suitable limit regarding both the hardness of the sand mold and the choice of the pressure medium.
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.
With regard to the reduction of pressure, two oppositely directed phenomena must be weighed one against the other. On one hand, the pressure drop should not be too rapid, because cracks could form in the molds; whereas, on the other hand, too much time should not be taken for the pressure to drop, otherwise the cycle times for producing the molds would become too long. An upper limit would be in the range of about 2 atmospheres (absolute)/second, up to which limit, crack-free molds with a clean surface can be produced. The maximum pressure is reduced in a time ranging from 0.2 sec. to about 1.5 sec.
In the afore-described process use is made of four parameters to define a pressure surge. These parameters are the increasing pressure gradient, the maximum pressure, the duration of maximum pressure, and the decreasing pressure gradient. These parameters may be varied independently.
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.
Additional influencing factors were investigated to determine the above-mentioned optimum values. Thus, a boundary surface concentration of the raw material particles of 10-9 to 5·10-9 mole/centimeter2, and especially, moreover, a concentration of 1.9 to 2.5·10-9 mole/centimeter2, has been found to be advantageous.
In addition, with regard to making a choice of raw material particles, a determination was made relating to the velocity of propagation of elastic longitudinal waves in such particles, wherein a value of 4 to 7 kilometers/second, and preferably, a velocity of 5.8 to 6.0 kilometers/second, was found to be especially favorable.
For the tests, use was made of raw material particles which had a major constituent which was silicon dioxide. These particles had a compactability which lay between 27 and 60%, and preferably, 32 to 45%.
Compactibility relates to the decrease in volume of the casting mixture after the pressure surge is applied thereto.
Advantageously, 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/centimeter2 is produced on the surface of the pattern.
The limiting values thus determined for the pressure rise, for the maximum value and for the pressure reduction, yield data for the optimal operation of equipment for compacting sand.
Claims (14)
1. A method for manufacturing molds from casting sand or other mixture comprising raw material particles, binder and water, by applying a pressure surge wave to said casting sand or other mixture in a closed chamber, said pressure surge wave being formed by a process comprising the steps of:
(a) starting from atmospheric pressure in said chamber, increasing said pressure with a pressure gradient of at least about 50 atmospheres/sec to a .[.maximum.]. pressure of at least about 2 atmospheres;
(b) maintaining said .[.maximum.]. pressure .[.of at least.]. .Iadd.in said chamber equal to or above .Iaddend.about 2 atmospheres for at least about 0.01 seconds;
(c) reducing said pressure .[.from said maximum pressure.]. to atmospheric pressure within .[.at least.]. about 0.2 seconds .Iadd.or more .Iaddend.from the initiation of the pressure increase.
2. A process according to claim 1, characterized in that the increasing pressure gradient has a maximum value of about 600 atmospheres (absolute)/sec.
3. A process according to claim 1, characterized in that the maximum value of the pressure p lies between about 4 and about 5.5 atmospheres (absolute).
4. A process according to claim 1, characterized in that the maximum gas pressure is maintained for 0.03 to 0.05 seconds.
5. A process according to claim 1, characterized in that the gas pressure is reduced within about 1.5 seconds.
6. A process according to claim 1, characterized in that the reduction in pressure is carried out using a decreasing pressure gradient up to about 2.0 atmospheres (absolute)/second.
7. A process according to claim 1, characterized in that use is made of raw material particles having a propagation velocity for elastic longitudinal waves of 4 to 7 kilometers/second, and preferably of 5.8 to 6.0 kilometers/second.
8. A process according to claim 1, characterized in that use is made of raw material particles whose boundary surface concentration is 10-9 to 5·10-9 mole/centimeter2, and preferably 1.9·10-9 to 2.5·10-9 mole/centimeter2.
9. A process according to claim 1, characterized in that the raw material particles comprise mainly silicon dioxide.
10. A process according to claim 1, characterized in that the pressure rise is effected by compressing a gas.
11. A process according to claim 1, characterized in that the pressure rise is produced by the exothermic reaction of an explosive gas mixture.
12. A process according to claim 1, characterized in that use is made of a mixture with a volume capable of being compacted by 27 to 60% upon application of said pressure surge wave, and preferably by 32 to 45%.
13. The use of the process according to claim 1, characterized in that a maximum pressure of 80 to 180 Newtons/centimeter2, is produced on the surface of a pattern. .Iadd.
14. A method for manufacturing molds from casting sand or other mixture comprising raw material particles, binder and water, by applying a pressure surge wave to said casting sand or other mixture in a closed chamber, said pressure surge wave being formed by a process comprising the steps of:
(a) starting from atmospheric pressure in said chamber, increasing said pressure with a pressure gradient of at least about 50 atmospheres/sec to a maximum pressure of at least about 2 atmospheres;
(b) maintaining said maximum pressure of at least about 2 atmospheres for at least about 0.01 seconds;
(c) reducing said pressure from said maximum pressure to atmospheric pressure within about 0.2 seconds or more from the initiation of the pressure increase. .Iaddend. .Iadd.15. A process according to claim 14, characterized in that the increasing pressure gradient has a maximum value of about 600 atmospheres (absolute)/sec. .Iaddend. .Iadd.16. A process according to claim 14, characterized in that the maximum value of the pressure lies between about 4 and about 5.5 atmospheres (absolute). .Iaddend. .Iadd.17. A process according to claim 14, characterized in that the maximum gas pressure is maintained for 0.03 to 0.05 seconds. .Iaddend. .Iadd.18. A process according to claim 14, characterized in that the gas pressure is reduced within about 1.5 seconds. .Iaddend. .Iadd.19. A process according to claim 14, characterized in that the reduction in pressure is carried out using a decreasing pressure gradient up to about 2.0 atmospheres (absolute)/second. .Iaddend. .Iadd.20. A process according to claim 14, characterized in that use is made of raw material particles having a propagation velocity for elastic longitudinal waves of 4 to 7 kilometers/second, and preferably of 5.8 to 6.0 kilometers/second. .Iaddend. .Iadd.21. A process according to claim 14, characterized in that use is made of raw material particles whose boundary surface concentration is 10-9 to 5×10-9 mole/centimeter2, and preferably 1.9×10-9 to 2.5×10-9 mole/centimeter2. .Iaddend. .Iadd.22. A process according to claim 14, characterized in that the raw material particles comprise mainly silicon dioxide. .Iaddend. .Iadd.23. A process according to claim 14, characterized in that the pressure rise is effected by compressing a gas. .Iaddend. .Iadd.24. A process according to claim 14, characterized in that the pressure rise is produced by the exothermic reaction of an explosive gas mixture. .Iaddend. .Iadd.25. A process according to claim 14, characterized in that use is made of a mixture with a volume capable of being compacted by 27 to 60% upon application of said pressure surge wave, and preferably by 32 to 45%. .Iaddend. .Iadd.26. The use of the process according to claim 14, characterized in that a maximum pressure of 80 to 180 Newtons/centimeter2, is produced on the surface of a pattern. .Iaddend.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19813149172 DE3149172A1 (en) | 1981-12-11 | 1981-12-11 | "METHOD FOR PRODUCING MOLDED BODIES USING GAS PRESSURE" |
| 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 (en) |
| EP (1) | EP0096045A1 (en) |
| JP (1) | JPS58502090A (en) |
| AU (1) | AU1013183A (en) |
| CA (1) | CA1217620A (en) |
| DD (1) | DD208311B5 (en) |
| DE (1) | DE3149172A1 (en) |
| DK (1) | DK364983D0 (en) |
| IT (1) | IT1191115B (en) |
| WO (1) | WO1983002078A1 (en) |
| ZA (1) | ZA829066B (en) |
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 (en) * | 1983-12-09 | 1985-06-20 | BMD Badische Maschinenfabrik Durlach GmbH, 7500 Karlsruhe | DEVICE FOR COMPRESSING FOUNDRY MOLD BY PRESSURE GAS |
| CH666636A5 (en) * | 1984-01-09 | 1988-08-15 | Fischer Ag Georg | PROCESS FOR COMPRESSING GRAINY MOLDING MATERIALS. |
| CH672270A5 (en) * | 1986-12-17 | 1989-11-15 | Fischer Ag Georg | |
| US5136497A (en) * | 1990-07-12 | 1992-08-04 | Bdm International, Inc. | Material consolidation modeling and control system |
| US5202837A (en) * | 1990-07-12 | 1993-04-13 | Coe Carlos J | Material consolidation modeling and control system |
| CH686412A5 (en) * | 1992-03-10 | 1996-03-29 | Fischer Georg Giessereianlagen | A method of compacting molding sand for molds. |
| BRPI0114571B1 (en) | 2000-10-11 | 2016-11-08 | Rovi Guides Inc | systems and methods for providing on-demand or on-demand media storage on server servers |
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 (en) * | 1971-06-08 | 1973-01-19 | Dynamit Nobel Ag | |
| DE2249244A1 (en) * | 1972-10-07 | 1974-04-11 | Buderus Eisenwerk | Explosive compaction and hardening of moulding sand - contg. plastics binder, by controlled detonation of gas mixts esp. hydrogen- oxygen |
| DE2844464B1 (en) * | 1978-10-12 | 1980-04-24 | Eugen Dipl-Ing Buehler | Method and device for compacting casting molds |
| 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 (en) * | 1979-04-04 | 1984-01-31 | Fischer Ag Georg | METHOD AND DEVICE FOR COMPRESSING MOLDING MATERIALS. |
| 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/en not_active Ceased
-
1982
- 1982-12-06 IT IT24627/82A patent/IT1191115B/en active
- 1982-12-08 DD DD24571082A patent/DD208311B5/en not_active IP Right Cessation
- 1982-12-09 WO PCT/CH1982/000131 patent/WO1983002078A1/en not_active Ceased
- 1982-12-09 US US06/880,721 patent/USRE32622E/en not_active Expired - Fee Related
- 1982-12-09 AU AU10131/83A patent/AU1013183A/en not_active Abandoned
- 1982-12-09 ZA ZA829066A patent/ZA829066B/en unknown
- 1982-12-09 US US06/531,827 patent/US4546810A/en not_active Ceased
- 1982-12-09 EP EP82903449A patent/EP0096045A1/en not_active Withdrawn
- 1982-12-09 JP JP82503576A patent/JPS58502090A/en active Pending
- 1982-12-10 CA CA000417439A patent/CA1217620A/en not_active Expired
-
1983
- 1983-08-10 DK DK3649/83A patent/DK364983D0/en 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 (en) * | 1971-06-08 | 1973-01-19 | Dynamit Nobel Ag | |
| DE2249244A1 (en) * | 1972-10-07 | 1974-04-11 | Buderus Eisenwerk | Explosive compaction and hardening of moulding sand - contg. plastics binder, by controlled detonation of gas mixts esp. hydrogen- oxygen |
| DE2844464B1 (en) * | 1978-10-12 | 1980-04-24 | Eugen Dipl-Ing Buehler | Method and device for compacting casting molds |
| 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 |
|---|---|
| IT8224627A0 (en) | 1982-12-06 |
| JPS58502090A (en) | 1983-12-08 |
| EP0096045A1 (en) | 1983-12-21 |
| CA1217620A (en) | 1987-02-10 |
| DD208311B5 (en) | 1994-08-25 |
| DD208311A5 (en) | 1984-05-02 |
| DK364983A (en) | 1983-08-10 |
| IT1191115B (en) | 1988-02-24 |
| WO1983002078A1 (en) | 1983-06-23 |
| IT8224627A1 (en) | 1984-06-06 |
| AU1013183A (en) | 1983-06-30 |
| DK364983D0 (en) | 1983-08-10 |
| US4546810A (en) | 1985-10-15 |
| DE3149172A1 (en) | 1983-06-30 |
| ZA829066B (en) | 1983-09-28 |
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