CA1205975A - Apparatus for compacting granular molding material - Google Patents
Apparatus for compacting granular molding materialInfo
- Publication number
- CA1205975A CA1205975A CA000438864A CA438864A CA1205975A CA 1205975 A CA1205975 A CA 1205975A CA 000438864 A CA000438864 A CA 000438864A CA 438864 A CA438864 A CA 438864A CA 1205975 A CA1205975 A CA 1205975A
- Authority
- CA
- Canada
- Prior art keywords
- mold unit
- passage opening
- pressure chamber
- adapter
- transverse cross
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Devices For Molds (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An apparatus for compacting granular molding materials, particularly foundry molding sand, has a passageway between the pressure chamber and the mold unit with a variable transverse cross-sectional area provided by an adapter. The variation in the passageway cross-sectional area is preferably provided by a replaceable insert. The apparatus permits treatment of different mold unit configurations and sizes.
An apparatus for compacting granular molding materials, particularly foundry molding sand, has a passageway between the pressure chamber and the mold unit with a variable transverse cross-sectional area provided by an adapter. The variation in the passageway cross-sectional area is preferably provided by a replaceable insert. The apparatus permits treatment of different mold unit configurations and sizes.
Description
7~i 2208~
PATENT APPLICATION
~f ..
KURT FISCHER
and GEORGES LOUYS
for APPARATUS FOR COMPACTING GRANVLAR MOL~ING ~TERIAL
Field Of The Invention The present invention relates to an apparatus for compacting granular molding materials which can be readily adapted to different molds.
Back~round Of The Invention There are numerous conventional methods and appara-tus for compactin~ molding matPrials wherein the molding materials a~e compacted by a surge o~ pressure resulting from an exothermic reaction of a ~uel mixture or from a highly pressurized gas~ For example r in U.S. Patent No.
3,170,202 to Huston et al, a combustion chamber receives a fuel mixture and is placed over a mold unit. Follow-ing formation of a closed system by the combustion chamber and mold unit, the exothermic reaction is triggered creating a surge of pressure on the molding material.
In another system disclosed in DT-PS l9 61 234, a pressure chamber stores a highly pressurized gas, and is detachably connected with a mold unit to form a closed system~ The compressed air~is highly pressurized in the pressure chamber and expands suddenly over the molding : . ~
~s~
material upon opening of a valve to compact the mass of molding material.
~ oth of these systems experience the same problem in that each system can only be used for one size o~ mold unit. T~us, a foundry requires a plurality o~ these conventional compacting mechanisms for the different mold unit si~es.
Summary Of ~he Invention An object of the present invention is to provide an apparatus for compacting granular molding materials which can form a closed system with and treat molding materials in different mold unit configurations and sizes, while employing the same compacting apparatus.
According to the present invention there is pxovided an apparatus for compacting granular molding material, particularly foundry molding sand, comprising:
a mold unit including a pattern plate supporting apattern thereon, and a molding frame coupled to and surrounding said pattern plate and said pattern;
a pressure chamber forming a closed system with said mold unit;
pressure means, ~oupled to said pressure chamber, for generating a shock pressure in a gaseous medium to be applied on a surface of loose molding material in said mold unit;
an adapter, mounted between said pressure chamber and said mold unit, for defining a passageway between said pressure chamber and said mold unit; and means, mounted on said adapter, for adapting the transverse cross-sectional area of said passageway to said mold unit.
Other objects, advantages and salient features of the present invention will become appar~nt from the following detailed description, whieh, taken in conjunction ~2~ 5 with the annexed drawings, discloses preferred embodiments of the present invention.
Brief Description Of The Drawin~s Referring to the drawings which form a part of this 5 disclosure:
.
- 2a -s~
Figure 1 is a side elevational view in section of an apparatus for compacting molding material by an exothermic reaction according ~o the present invention;
Figure 2 is a side ~levational view in section of an apparatus for compacting molding materials by highly pressurized, compressed air according to the present lnventlon .
Detailed Description OE Preferred Embodiments Of The Invention Fig. 1 illustrates an apparatus according to the present invention with a pressure chamber 1 for an exotherrnic reaction. The bottom joint of pressure chamber 1 is formed by an insert 2 with a passage opening 3, which insert is mounted in an adapter 4.
Adapter 4 is carried by supports 5~ Opening 3 can be rvund, polygonal, conical or cylindrical. Advan-tageously, insert 2 is replaceable. The dimensions of the opening 3 can he varied as necessary~ so that a number of mold unit configurations and sizes can be used.
A cover 6 forms the top of pressure chamber 1. A
motor 7 for a fan 8 is mounted on cover 6 with the fan projecting into chamber 1~ A conduit 9 is mounted within ~he pressure chamber to increase the efec-tiveness of fan 8. A fuel `feed line 1~, e.g., for natural gas, is attached to the interior of the pressure chamber. The fuel is fed from a ~uel source through a dosing device 11. An ignition plug 12, controlled ~y an ignition control 13, is mounted in cover 6 of chamber 1 to trigger the exothermic reaction required for creating a pressure surge. Alternatively, plug 12 could be mounted in the area o~ conduit 9.
~ he space defined between supports 5 and adapter 4 encloses a mold unit. The mold unit comprises a molding frame including a frame 16 and a molding box 17. A
pattern plate 18 with a p~ttern are surrounded by the molding frame such that the molding unit can be loosely filled with granular molding matexial. The filled mold Z~5~
unit is mounted on a li~ting table 20. A r~ller train 21 can be used or conveying unit to and from the pxessure chamber.
Figure 2 illustrates an apparatus for compacting granular molding materials with a pressure chamber 25 employing a highly pressuri~ed gas, e.g. compressed air, to produ-e a surge of yas pressure. The pressure chamber 25 is superimposed on an insert 26 with a passage opening 27. Insert 26 mounted in an adapter 28.
The adapter 28 is configured as a plate and is supported by supports 29. A compacting unit comprising pressure chamber 25 and adapter 28 is connected with the mold unit to form a closed system.
The top of pressure chamber 25 is formed by a cover 30 which supports thrust piston drive 31. Thrust piston drive 31 operates a valve 32 covering passage opening 27. A gaseous or a liquid medium can be used for operating thrust piston drive 31. Additionally, elec-trically operated devices could also be used for thrust piston drive 31.
An aeration conduit 33 extends from passage opening 27 to a valve 34 for relieving pressure in chamber 25.
~n optional sound damper 35 can connect valve 34 to the surrounding atmosphere.
An air feed line 37 passes through cover 30. Line 37 includes a manometer 36 controll~d ~y a valve 38 to build-up pressure in pressure chamber 25.
Similar to the apparatus of Figure 1~ a mold unit is arranged under passage opening 27, i.e. under valve 32. The apparatus is illustrated in the position just after the molding material 22 has been compacted. In Figure 1, the apparatus is illustrated at the point when th~ molding material 22 is still uncompacted.
The mold unit used corresponds to that described in connection with Figure 1.
The operation of the device at Figure 1 involves filling the mold unit with a dosed quantity of molding material. The filled mold unit is conv~yed by the s~
roller train 21 to the li~ting table 21, and is then raised under the passage opening 3 of the insert.
A~ter the mold unit is connected tightly to the adapter 4, a dosed quantity of a fuel flows from the dosing devi~e 11 into the pressure chamber~ where the fuel is combined with the air present in the pressure chamber to form a fuel-air mixture. The fuel-air mixture is forced to move rapidly by movement of the fan 8. During the rapid movement of the fuel-air mixture, the ignition control 13 causes the ignition plug to trigger an exothermic reaction in the fuel-air mixture creating a surge of pressure. After the reaction, the mold unit can be lowered from the adapter 4 and the buxned gases can be exhausted through the opening between the adapter and the mold unit.
The operation of the apparatus of Figure 2 differs only in the manner the surge o pressure is produced.
After the assembly of the mold unit and pressure chamber 25 to form a closed system, a gaseous medium, for example, compressed air, is conveyed through feed line 31 via the pressure control valve 38 to develop a compression pressure. Alternatively, the compression pressure can be developed before connection with the mold unit.
After the mold unit is connected and the pressure is built up in the pressure chamber, val~ 32 is opened suddenly and the pressurized air is expanded and forms a pressure surge through tha opening 27 and over the molding material surface.
Following compacting of the molding material, the valve 32 is closed and the pressure medium remaining over the molding material surface is exhausted. A
damper 35 can show the outflow of compressed air. After relieving the pressure over the molding material, valve 34 is closed and the mold unit is lowered.
The system of the present invention is advantageous since mold units of different si~es and geometric shapes can be compacted without difficulty and with relatively ~ ` ~
:~Z~5~S
low capital outlay. The same compacting mechanism can be used with differently sixed and shaped mold units merely by changing the xeplaceable insert 2 or 26. The present invention can also be used for molding opera~
tions wherein compactirlg is performed by press tools.
While various embodiments have been chosen -to illustrate the invention, it will be understood by those skilled int he art that various changes and modifica-tions can be made therein withou~ departing from the scope of the invention as defined in the appended claims.
PATENT APPLICATION
~f ..
KURT FISCHER
and GEORGES LOUYS
for APPARATUS FOR COMPACTING GRANVLAR MOL~ING ~TERIAL
Field Of The Invention The present invention relates to an apparatus for compacting granular molding materials which can be readily adapted to different molds.
Back~round Of The Invention There are numerous conventional methods and appara-tus for compactin~ molding matPrials wherein the molding materials a~e compacted by a surge o~ pressure resulting from an exothermic reaction of a ~uel mixture or from a highly pressurized gas~ For example r in U.S. Patent No.
3,170,202 to Huston et al, a combustion chamber receives a fuel mixture and is placed over a mold unit. Follow-ing formation of a closed system by the combustion chamber and mold unit, the exothermic reaction is triggered creating a surge of pressure on the molding material.
In another system disclosed in DT-PS l9 61 234, a pressure chamber stores a highly pressurized gas, and is detachably connected with a mold unit to form a closed system~ The compressed air~is highly pressurized in the pressure chamber and expands suddenly over the molding : . ~
~s~
material upon opening of a valve to compact the mass of molding material.
~ oth of these systems experience the same problem in that each system can only be used for one size o~ mold unit. T~us, a foundry requires a plurality o~ these conventional compacting mechanisms for the different mold unit si~es.
Summary Of ~he Invention An object of the present invention is to provide an apparatus for compacting granular molding materials which can form a closed system with and treat molding materials in different mold unit configurations and sizes, while employing the same compacting apparatus.
According to the present invention there is pxovided an apparatus for compacting granular molding material, particularly foundry molding sand, comprising:
a mold unit including a pattern plate supporting apattern thereon, and a molding frame coupled to and surrounding said pattern plate and said pattern;
a pressure chamber forming a closed system with said mold unit;
pressure means, ~oupled to said pressure chamber, for generating a shock pressure in a gaseous medium to be applied on a surface of loose molding material in said mold unit;
an adapter, mounted between said pressure chamber and said mold unit, for defining a passageway between said pressure chamber and said mold unit; and means, mounted on said adapter, for adapting the transverse cross-sectional area of said passageway to said mold unit.
Other objects, advantages and salient features of the present invention will become appar~nt from the following detailed description, whieh, taken in conjunction ~2~ 5 with the annexed drawings, discloses preferred embodiments of the present invention.
Brief Description Of The Drawin~s Referring to the drawings which form a part of this 5 disclosure:
.
- 2a -s~
Figure 1 is a side elevational view in section of an apparatus for compacting molding material by an exothermic reaction according ~o the present invention;
Figure 2 is a side ~levational view in section of an apparatus for compacting molding materials by highly pressurized, compressed air according to the present lnventlon .
Detailed Description OE Preferred Embodiments Of The Invention Fig. 1 illustrates an apparatus according to the present invention with a pressure chamber 1 for an exotherrnic reaction. The bottom joint of pressure chamber 1 is formed by an insert 2 with a passage opening 3, which insert is mounted in an adapter 4.
Adapter 4 is carried by supports 5~ Opening 3 can be rvund, polygonal, conical or cylindrical. Advan-tageously, insert 2 is replaceable. The dimensions of the opening 3 can he varied as necessary~ so that a number of mold unit configurations and sizes can be used.
A cover 6 forms the top of pressure chamber 1. A
motor 7 for a fan 8 is mounted on cover 6 with the fan projecting into chamber 1~ A conduit 9 is mounted within ~he pressure chamber to increase the efec-tiveness of fan 8. A fuel `feed line 1~, e.g., for natural gas, is attached to the interior of the pressure chamber. The fuel is fed from a ~uel source through a dosing device 11. An ignition plug 12, controlled ~y an ignition control 13, is mounted in cover 6 of chamber 1 to trigger the exothermic reaction required for creating a pressure surge. Alternatively, plug 12 could be mounted in the area o~ conduit 9.
~ he space defined between supports 5 and adapter 4 encloses a mold unit. The mold unit comprises a molding frame including a frame 16 and a molding box 17. A
pattern plate 18 with a p~ttern are surrounded by the molding frame such that the molding unit can be loosely filled with granular molding matexial. The filled mold Z~5~
unit is mounted on a li~ting table 20. A r~ller train 21 can be used or conveying unit to and from the pxessure chamber.
Figure 2 illustrates an apparatus for compacting granular molding materials with a pressure chamber 25 employing a highly pressuri~ed gas, e.g. compressed air, to produ-e a surge of yas pressure. The pressure chamber 25 is superimposed on an insert 26 with a passage opening 27. Insert 26 mounted in an adapter 28.
The adapter 28 is configured as a plate and is supported by supports 29. A compacting unit comprising pressure chamber 25 and adapter 28 is connected with the mold unit to form a closed system.
The top of pressure chamber 25 is formed by a cover 30 which supports thrust piston drive 31. Thrust piston drive 31 operates a valve 32 covering passage opening 27. A gaseous or a liquid medium can be used for operating thrust piston drive 31. Additionally, elec-trically operated devices could also be used for thrust piston drive 31.
An aeration conduit 33 extends from passage opening 27 to a valve 34 for relieving pressure in chamber 25.
~n optional sound damper 35 can connect valve 34 to the surrounding atmosphere.
An air feed line 37 passes through cover 30. Line 37 includes a manometer 36 controll~d ~y a valve 38 to build-up pressure in pressure chamber 25.
Similar to the apparatus of Figure 1~ a mold unit is arranged under passage opening 27, i.e. under valve 32. The apparatus is illustrated in the position just after the molding material 22 has been compacted. In Figure 1, the apparatus is illustrated at the point when th~ molding material 22 is still uncompacted.
The mold unit used corresponds to that described in connection with Figure 1.
The operation of the device at Figure 1 involves filling the mold unit with a dosed quantity of molding material. The filled mold unit is conv~yed by the s~
roller train 21 to the li~ting table 21, and is then raised under the passage opening 3 of the insert.
A~ter the mold unit is connected tightly to the adapter 4, a dosed quantity of a fuel flows from the dosing devi~e 11 into the pressure chamber~ where the fuel is combined with the air present in the pressure chamber to form a fuel-air mixture. The fuel-air mixture is forced to move rapidly by movement of the fan 8. During the rapid movement of the fuel-air mixture, the ignition control 13 causes the ignition plug to trigger an exothermic reaction in the fuel-air mixture creating a surge of pressure. After the reaction, the mold unit can be lowered from the adapter 4 and the buxned gases can be exhausted through the opening between the adapter and the mold unit.
The operation of the apparatus of Figure 2 differs only in the manner the surge o pressure is produced.
After the assembly of the mold unit and pressure chamber 25 to form a closed system, a gaseous medium, for example, compressed air, is conveyed through feed line 31 via the pressure control valve 38 to develop a compression pressure. Alternatively, the compression pressure can be developed before connection with the mold unit.
After the mold unit is connected and the pressure is built up in the pressure chamber, val~ 32 is opened suddenly and the pressurized air is expanded and forms a pressure surge through tha opening 27 and over the molding material surface.
Following compacting of the molding material, the valve 32 is closed and the pressure medium remaining over the molding material surface is exhausted. A
damper 35 can show the outflow of compressed air. After relieving the pressure over the molding material, valve 34 is closed and the mold unit is lowered.
The system of the present invention is advantageous since mold units of different si~es and geometric shapes can be compacted without difficulty and with relatively ~ ` ~
:~Z~5~S
low capital outlay. The same compacting mechanism can be used with differently sixed and shaped mold units merely by changing the xeplaceable insert 2 or 26. The present invention can also be used for molding opera~
tions wherein compactirlg is performed by press tools.
While various embodiments have been chosen -to illustrate the invention, it will be understood by those skilled int he art that various changes and modifica-tions can be made therein withou~ departing from the scope of the invention as defined in the appended claims.
Claims (14)
1. An apparatus for compacting granular molding material, particularly foundry molding sand, comprising:
a mold unit including a pattern plate supporting a pattern thereon, and a molding frame coupled to and surrounding said pattern plate and said pattern;
a pressure chamber forming a closed system with said mold unit;
pressure means, coupled to said pressure chamber, for generating a shock pressure in a gaseous medium to be applied on a surface of loose molding material in said mold unit;
an adapter, mounted between said pressure chamber and said mold unit, for defining a passageway between said pressure chamber and said mold unit; and means, mounted on said adapter, for adapting the transverse cross-sectional area of said passageway to said mold unit.
a mold unit including a pattern plate supporting a pattern thereon, and a molding frame coupled to and surrounding said pattern plate and said pattern;
a pressure chamber forming a closed system with said mold unit;
pressure means, coupled to said pressure chamber, for generating a shock pressure in a gaseous medium to be applied on a surface of loose molding material in said mold unit;
an adapter, mounted between said pressure chamber and said mold unit, for defining a passageway between said pressure chamber and said mold unit; and means, mounted on said adapter, for adapting the transverse cross-sectional area of said passageway to said mold unit.
2. An apparatus according to claim 1 wherein maximum transverse cross-sectional dimensions of said passageway correspond to minimum transverse cross sectional dimensions of said mold unit.
3. An apparatus according to claim 1 wherein said adapter comprises at least one passage opening therein.
4. An apparatus according to claim 3 wherein said passage opening has adjustable means, mounted on said adapter, for varying transverse cross-sectional dimen-sions said passage opening.
5. An apparatus according to claim 4 wherein transverse cross-sectional dimensions of said passageway are substantially equal to transverse cross-sectional dimensions of said mold unit.
6. An apparatus according to claim 5 wherein said adjustable means comprises a removable insert mounted in said passageway.
7. An apparatus according to claim 6 wherein said insert is tubular.
8. An apparatus according to claim 6 wherein said insert comprises a plate.
9. An apparatus according to claim 6 wherein said passage opening is circular.
10. An apparatus according to claim 6 wherein said passage opening is polygonal.
11. An apparatus according to claim 6 wherein said passage opening is frustoconical.
12. An apparatus according to claim 6 wherein said passage opening is cylindrical.
13. An apparatus according to claim 6 wherein said adapter is detachably coupled to said pressure chamber on one side thereof and to said mold unit on an opposite side thereof.
14. An apparatus according to claim 13 wherein maximum transverse cross-sectional dimensions of said passage opening are not greater than an opening of said mold unit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH5982/82-9 | 1982-10-13 | ||
| CH598282A CH660987A5 (en) | 1982-10-13 | 1982-10-13 | DEVICE FOR COMPRESSING GRAINY MOLDS. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1205975A true CA1205975A (en) | 1986-06-17 |
Family
ID=4302467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000438864A Expired CA1205975A (en) | 1982-10-13 | 1983-10-12 | Apparatus for compacting granular molding material |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0106219A3 (en) |
| CA (1) | CA1205975A (en) |
| CH (1) | CH660987A5 (en) |
| DD (1) | DD211971A5 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH675553A5 (en) * | 1988-01-14 | 1990-10-15 | Fischer Ag Georg |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2877522A (en) * | 1955-04-14 | 1959-03-17 | Pettibone Mulliken Corp | Mold blowing apparatus |
| US3089206A (en) * | 1958-01-13 | 1963-05-14 | Osborn Mfg Co | Blow and squeeze molding machine and method of molding |
| DE3202395A1 (en) * | 1981-01-28 | 1982-08-26 | BMD Badische Maschinenfabrik Durlach GmbH, 7500 Karlsruhe | Process and equipment for pneumatic compaction of moulding sand |
-
1982
- 1982-10-13 CH CH598282A patent/CH660987A5/en not_active IP Right Cessation
-
1983
- 1983-09-27 EP EP83109608A patent/EP0106219A3/en not_active Withdrawn
- 1983-10-11 DD DD25557683A patent/DD211971A5/en not_active IP Right Cessation
- 1983-10-12 CA CA000438864A patent/CA1205975A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| EP0106219A3 (en) | 1985-05-15 |
| DD211971A5 (en) | 1984-08-01 |
| CH660987A5 (en) | 1987-06-30 |
| EP0106219A2 (en) | 1984-04-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |