CA1051630A - Low pressure casting equipment - Google Patents
Low pressure casting equipmentInfo
- Publication number
- CA1051630A CA1051630A CA206,832A CA206832A CA1051630A CA 1051630 A CA1051630 A CA 1051630A CA 206832 A CA206832 A CA 206832A CA 1051630 A CA1051630 A CA 1051630A
- Authority
- CA
- Canada
- Prior art keywords
- pump
- casting
- metal
- molten metal
- metal melt
- 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
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Induction Heating (AREA)
- Continuous Casting (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Prevention Of Electric Corrosion (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The present invention provides low pressure casting equip-ment for manufacturing cast products for metal or metal alloys including an inductive or electrodynamic metal melt pump.
The present invention provides low pressure casting equip-ment for manufacturing cast products for metal or metal alloys including an inductive or electrodynamic metal melt pump.
Description
53L~3~
This invention relates to apparatus for casting molten ~, metal.
According to the present inven-tion there is provided apparatus for casting molten metal, comprising a melting furn-ace, a casting area and a connec-tion for supplying molten metal ; from the melting furnace to the casting area, the connection comprising two channels for the passage of molten metal which constitutes a secondary winding of a transformer, the primary windings of which are wound on a closed iron core having three 10 legs between ad~acent ones of which pass the respective channels, and the casting area comprising an induction metal melt pump for pumping molten metal vertically upwards into a die mounted above the pump.
The induction metal melt pump developing pressure energy does not comprise any moving parts, therefore its operat-ing safety is very favourable.
The casting apparatus according to the invention is of very simple construction.
The apparatus can be put into operation immediately after the metal to be cast is heated to fusing temperature, as -the casting pressure occurs immediately after switching on the -excitation of the induction metal pump. It follows therefore that the cycling time of castings may be reduced to a minimum.
The casting pressure can be controlled electrically by varying the excitation of the induction metal melt pump, and control may be automated electrically. Also, the casting ~ ' l~S163~
pressure can be varied during casting. By these measures signif-icant improvements of casting quality may be achieved.
The apparatus according to the invention can be operated with the smallest possible cycle -time, and it may be automated electrically, ensuring significant economic advan-tages in comparison with traditional low pressure casting devices.
The apparatus according to the invention is suitable for the production of parts made of metals and metal alloys, especially aluminium, magnesium, zinc and al]oys thereof.
An embodiment of the present invention will now be described by way of example with reference to -the accompanying drawings in which:
Fig. 1 is an elevation of the multipit type of low pressure casting apparatus according to one embodiment of the invention;
Fig. 2 is a plan view of the device in Fig. l;
Fig. 3 is an enlarged sectional elevation of the ;~
device in Fig. 2 taken along the line A-A; and Fig. 4 is a cross-sectional plan view of the device in Fig. 3 taken along the line B-B.
.
ii3~
In the drawings, three casting areas 48 to be programmed independently from each other are served by a melting furnace 42 through channe:Ls 52 with molten metal 65 necessary for casting. The furnace 42 is surrounded by a steel jacket 63 and provided with heat insulation 64. The - melting furnace 42 is covered by a heat insulated cap 41, in order to reduce heat losses to a possible minimum.
Heating and holding hot metal melt 65, as well as replacing material diminution due to castings,and generation of heat for fusing metals charged into the melting pit 62, are effected in the channels 52. The channels 52 are defined by heat and electrically insulating channel stones 66.
Channel stones 66 are surrounded on the outside by two, electrically insulated from each other, steel half sheaths 55, which are also electrically insulated from the jacket 63 of the melting furnace 42, and also from a steel sheath 56 of the casting working place 48, in order to avoid eddy current losses. Metal melt 65 constitutes with a laminated closed iron core 54 and a primary winding 49, a single phase transformer, the single turn secondary winding of which is formed by the metal melt 65 in the channel 52. Joule loss of the secondary winding heats the metal melt 65. The iron core 54 and windings 49 are intensively air cooled. The windings 49 are directly energized by the central distribution box 50 connected to a control board (not shown) by a bundle of cables 51.
.~
3L0~ 3~
-` The casting working place 48 is equipped with an anti-magnetic steel shea~h 56, inside of which heat insulation 67 defines the casting pit 57. A solid ferromagnetic yoke 69 is immersed in the me-tal melt 65, the yoke 69 being provided with a ceramic protective layer and a laterally closed metal melt pump channel 70 Eormed by a channe] cover 71 made of antimag-netic steel and provided with a ceramic protective layer. The pump comprises windings 74 located in slots of the laminated iron core 73, the windings 74 being arranged outside the heat insulation 67 of the working place 4~ and are surrounded by the antimagnetic steel enclosure 72, the magnetic yoke 69 immersed in the metal melt 65, provided with a ceramic protective layer, the antimagnetic channel cover 71 and the channel 70.
By connecting the windings 74 of the metal melt pump to an alternating current, the windings 74 create an alternating magnetic field in the channel 70 and induce in the metal melt within the channel 70 and alternating voltage. As a result of the induced voltage, eddy currents arise in the metal melt in the channel. The interaction of eddy currents and the alternat- ~ -ing magnetic field established in the channel 70 by windings 74, cause the metal melt to be forced to move against the force of gravity in the channel.- The magnitude of the force impel-ling the metal melt to move, as a result of which the casting pressure comes into being, may continually be controlled by varying steplessly the voltage connected to the windings 74.
The windings 74 are supplied from the central distribution bore 50. A voltage controller controls the voltage supplied to the induction metal melt pump and therefore, also the casting pres-sure.
The air tight antimagnetic steel enclosure 72 is secured on a supporting beam 75 fixed to a sheath 56. The insulating coolant enters for cooling the laminated iron core .' " . ' ' ' ' ' ' . : ~.
`;; " 1~5~L~ii3~
73 and the windin~s 74 through a coolant inlet 58 into the space defined by enclosure 72 and leaves through a coolant outlet 59.
As a result of the casting pressure developed by the induction metal melt pump, built up from parts 69, 70, 71, 73, 74, the metal melt flows through channel 47, connected air tightly to channel 70 - which is heated electrically indirectly by heating element 68, supplied rrom the central distribution box 50 - to the die 43, located on the working table 45. The working table 45 is secured by feet 46 on the enclosure 56 of the casting working place 4~. On working table 45 the die and core moving device 44 connected to die ; 43 is located, effecting also removal of the work piece from the die, actuation being electro-pneumatical.
Cleaning of ehannels 52 after draining off metal melt 65, is effected through a draining off pipe 79, elosed by stopper 78, heated eleetrieally by heating element 77 (supplied from distribution box 50), whieh will easily be aeeessible after removing the stopper 78 and of the formed solid metal plug 70, when melted eleetrically by heating element 77, following the removal of the eleaning hole plug.
Draining off the metal melt 65 and eleaning of ehannels 52 beeomes possible after opening a door 60.
The multipit type of the low pressure easting equip-ment aeeording to the invention, also has a remotely loeated eontrol board, not represented on the drawing, and is eonneeted to the equipment by a bundle of eables. This eontrol board ineludes the temperature eontroller governed by heat sensor 53, eontrollers aetuating the programmed easting pressure and the apparatus for energy distribution.
In the ease of eomplete automation, other apparatus neeessary for automation are housed in the eontrol board. In S~3~
this case also charyers governed by level sensors, transporting and other means too, are used.
. ..
. ~ :
~ ; ' . ' ; . .
This invention relates to apparatus for casting molten ~, metal.
According to the present inven-tion there is provided apparatus for casting molten metal, comprising a melting furn-ace, a casting area and a connec-tion for supplying molten metal ; from the melting furnace to the casting area, the connection comprising two channels for the passage of molten metal which constitutes a secondary winding of a transformer, the primary windings of which are wound on a closed iron core having three 10 legs between ad~acent ones of which pass the respective channels, and the casting area comprising an induction metal melt pump for pumping molten metal vertically upwards into a die mounted above the pump.
The induction metal melt pump developing pressure energy does not comprise any moving parts, therefore its operat-ing safety is very favourable.
The casting apparatus according to the invention is of very simple construction.
The apparatus can be put into operation immediately after the metal to be cast is heated to fusing temperature, as -the casting pressure occurs immediately after switching on the -excitation of the induction metal pump. It follows therefore that the cycling time of castings may be reduced to a minimum.
The casting pressure can be controlled electrically by varying the excitation of the induction metal melt pump, and control may be automated electrically. Also, the casting ~ ' l~S163~
pressure can be varied during casting. By these measures signif-icant improvements of casting quality may be achieved.
The apparatus according to the invention can be operated with the smallest possible cycle -time, and it may be automated electrically, ensuring significant economic advan-tages in comparison with traditional low pressure casting devices.
The apparatus according to the invention is suitable for the production of parts made of metals and metal alloys, especially aluminium, magnesium, zinc and al]oys thereof.
An embodiment of the present invention will now be described by way of example with reference to -the accompanying drawings in which:
Fig. 1 is an elevation of the multipit type of low pressure casting apparatus according to one embodiment of the invention;
Fig. 2 is a plan view of the device in Fig. l;
Fig. 3 is an enlarged sectional elevation of the ;~
device in Fig. 2 taken along the line A-A; and Fig. 4 is a cross-sectional plan view of the device in Fig. 3 taken along the line B-B.
.
ii3~
In the drawings, three casting areas 48 to be programmed independently from each other are served by a melting furnace 42 through channe:Ls 52 with molten metal 65 necessary for casting. The furnace 42 is surrounded by a steel jacket 63 and provided with heat insulation 64. The - melting furnace 42 is covered by a heat insulated cap 41, in order to reduce heat losses to a possible minimum.
Heating and holding hot metal melt 65, as well as replacing material diminution due to castings,and generation of heat for fusing metals charged into the melting pit 62, are effected in the channels 52. The channels 52 are defined by heat and electrically insulating channel stones 66.
Channel stones 66 are surrounded on the outside by two, electrically insulated from each other, steel half sheaths 55, which are also electrically insulated from the jacket 63 of the melting furnace 42, and also from a steel sheath 56 of the casting working place 48, in order to avoid eddy current losses. Metal melt 65 constitutes with a laminated closed iron core 54 and a primary winding 49, a single phase transformer, the single turn secondary winding of which is formed by the metal melt 65 in the channel 52. Joule loss of the secondary winding heats the metal melt 65. The iron core 54 and windings 49 are intensively air cooled. The windings 49 are directly energized by the central distribution box 50 connected to a control board (not shown) by a bundle of cables 51.
.~
3L0~ 3~
-` The casting working place 48 is equipped with an anti-magnetic steel shea~h 56, inside of which heat insulation 67 defines the casting pit 57. A solid ferromagnetic yoke 69 is immersed in the me-tal melt 65, the yoke 69 being provided with a ceramic protective layer and a laterally closed metal melt pump channel 70 Eormed by a channe] cover 71 made of antimag-netic steel and provided with a ceramic protective layer. The pump comprises windings 74 located in slots of the laminated iron core 73, the windings 74 being arranged outside the heat insulation 67 of the working place 4~ and are surrounded by the antimagnetic steel enclosure 72, the magnetic yoke 69 immersed in the metal melt 65, provided with a ceramic protective layer, the antimagnetic channel cover 71 and the channel 70.
By connecting the windings 74 of the metal melt pump to an alternating current, the windings 74 create an alternating magnetic field in the channel 70 and induce in the metal melt within the channel 70 and alternating voltage. As a result of the induced voltage, eddy currents arise in the metal melt in the channel. The interaction of eddy currents and the alternat- ~ -ing magnetic field established in the channel 70 by windings 74, cause the metal melt to be forced to move against the force of gravity in the channel.- The magnitude of the force impel-ling the metal melt to move, as a result of which the casting pressure comes into being, may continually be controlled by varying steplessly the voltage connected to the windings 74.
The windings 74 are supplied from the central distribution bore 50. A voltage controller controls the voltage supplied to the induction metal melt pump and therefore, also the casting pres-sure.
The air tight antimagnetic steel enclosure 72 is secured on a supporting beam 75 fixed to a sheath 56. The insulating coolant enters for cooling the laminated iron core .' " . ' ' ' ' ' ' . : ~.
`;; " 1~5~L~ii3~
73 and the windin~s 74 through a coolant inlet 58 into the space defined by enclosure 72 and leaves through a coolant outlet 59.
As a result of the casting pressure developed by the induction metal melt pump, built up from parts 69, 70, 71, 73, 74, the metal melt flows through channel 47, connected air tightly to channel 70 - which is heated electrically indirectly by heating element 68, supplied rrom the central distribution box 50 - to the die 43, located on the working table 45. The working table 45 is secured by feet 46 on the enclosure 56 of the casting working place 4~. On working table 45 the die and core moving device 44 connected to die ; 43 is located, effecting also removal of the work piece from the die, actuation being electro-pneumatical.
Cleaning of ehannels 52 after draining off metal melt 65, is effected through a draining off pipe 79, elosed by stopper 78, heated eleetrieally by heating element 77 (supplied from distribution box 50), whieh will easily be aeeessible after removing the stopper 78 and of the formed solid metal plug 70, when melted eleetrically by heating element 77, following the removal of the eleaning hole plug.
Draining off the metal melt 65 and eleaning of ehannels 52 beeomes possible after opening a door 60.
The multipit type of the low pressure easting equip-ment aeeording to the invention, also has a remotely loeated eontrol board, not represented on the drawing, and is eonneeted to the equipment by a bundle of eables. This eontrol board ineludes the temperature eontroller governed by heat sensor 53, eontrollers aetuating the programmed easting pressure and the apparatus for energy distribution.
In the ease of eomplete automation, other apparatus neeessary for automation are housed in the eontrol board. In S~3~
this case also charyers governed by level sensors, transporting and other means too, are used.
. ..
. ~ :
~ ; ' . ' ; . .
Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Apparatus for casting molten metal, comprising a melting furnace, a casting area and a connection for supplying molten metal from the melting furnace to the casting area, the connection comprising two channels for the passage of molten metal which constitutes a secondary winding of a transformer, the primary windings of which are wound on a closed iron core having three legs between adjacent ones of which pass the respective channels, and the casting area comprising an induc-tion metal melt pump for pumping molten metal vertically upwards into a die mounted above the pump.
2. Apparatus according to claim 1, wherein a channel of the pump, the connection channels and the pump are covered by an external metal layer.
3. Apparatus according to claim 1 or 2, wherein electrical heating means are arranged at the discharge end of the pump below the die.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| HUPA1169A HU168839B (en) | 1973-08-10 | 1973-08-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1051630A true CA1051630A (en) | 1979-04-03 |
Family
ID=11000372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA206,832A Expired CA1051630A (en) | 1973-08-10 | 1974-08-12 | Low pressure casting equipment |
Country Status (13)
| Country | Link |
|---|---|
| JP (1) | JPS5072824A (en) |
| AT (1) | AT342227B (en) |
| AU (1) | AU500789B2 (en) |
| CA (1) | CA1051630A (en) |
| DD (1) | DD115054A5 (en) |
| ES (1) | ES429118A1 (en) |
| FR (1) | FR2240064A1 (en) |
| GB (1) | GB1474757A (en) |
| HU (1) | HU168839B (en) |
| IT (1) | IT1019868B (en) |
| NL (1) | NL7410662A (en) |
| RO (1) | RO65037A (en) |
| SE (1) | SE407350B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55122660A (en) * | 1979-03-14 | 1980-09-20 | Toyota Motor Corp | Low pressure casting device |
| GB0311299D0 (en) * | 2003-05-16 | 2003-06-25 | Emp Technologies Ltd | Improvements in and relating to casting |
-
1973
- 1973-08-10 HU HUPA1169A patent/HU168839B/hu unknown
-
1974
- 1974-08-07 SE SE7410128A patent/SE407350B/en unknown
- 1974-08-08 NL NL7410662A patent/NL7410662A/en not_active Application Discontinuation
- 1974-08-09 DD DD180430A patent/DD115054A5/xx unknown
- 1974-08-09 IT IT26221/74A patent/IT1019868B/en active
- 1974-08-09 AU AU72193/74A patent/AU500789B2/en not_active Expired
- 1974-08-09 JP JP49090870A patent/JPS5072824A/ja active Pending
- 1974-08-09 ES ES429118A patent/ES429118A1/en not_active Expired
- 1974-08-09 FR FR7427772A patent/FR2240064A1/fr not_active Withdrawn
- 1974-08-09 AT AT653874A patent/AT342227B/en not_active IP Right Cessation
- 1974-08-09 GB GB3511974A patent/GB1474757A/en not_active Expired
- 1974-08-09 RO RO7479720A patent/RO65037A/en unknown
- 1974-08-12 CA CA206,832A patent/CA1051630A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB1474757A (en) | 1977-05-25 |
| ATA653874A (en) | 1977-07-15 |
| DD115054A5 (en) | 1975-09-12 |
| IT1019868B (en) | 1977-11-30 |
| AU500789B2 (en) | 1979-05-31 |
| DE2438060B2 (en) | 1976-11-11 |
| SE7410128L (en) | 1975-02-11 |
| SE407350B (en) | 1979-03-26 |
| FR2240064A1 (en) | 1975-03-07 |
| DE2438060A1 (en) | 1975-02-27 |
| JPS5072824A (en) | 1975-06-16 |
| HU168839B (en) | 1976-07-28 |
| NL7410662A (en) | 1975-02-12 |
| AT342227B (en) | 1978-03-28 |
| RO65037A (en) | 1979-08-15 |
| ES429118A1 (en) | 1976-09-01 |
| AU7219374A (en) | 1976-02-12 |
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