CA1337015C - Electromagnetic molten metal supply system - Google Patents
Electromagnetic molten metal supply systemInfo
- Publication number
- CA1337015C CA1337015C CA000595500A CA595500A CA1337015C CA 1337015 C CA1337015 C CA 1337015C CA 000595500 A CA000595500 A CA 000595500A CA 595500 A CA595500 A CA 595500A CA 1337015 C CA1337015 C CA 1337015C
- Authority
- CA
- Canada
- Prior art keywords
- molten metal
- maintaining
- electromagnetic
- coil
- supplying
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/30—Accessories for supplying molten metal, e.g. in rations
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K44/00—Machines in which the dynamo-electric interaction between a plasma or flow of conductive liquid or of fluid-borne conductive or magnetic particles and a coil system or magnetic field converts energy of mass flow into electrical energy or vice versa
- H02K44/02—Electrodynamic pumps
Abstract
This invention relates to an electromagnetic molten metal supply system in a die cast machine and so forth, in which an electromagnetic pump is immersed in a furnace for maintaining molten metal, and the supply tube of the pump is connected to an injection cylinder. The electromagnetic pump is provided with two groups of coils, one of which is for maintaining the molten metal and the other group of coils for supplying the molten metal, and these two coils are controlled separately.
Description
:) AN ELECTROMAGNETIC MOLTEN METAL SUPPLY SYSTEM
BACRGROUND OF 'ln~ lNv~lloN
1. Field of the Invention The present invention relates to an electromagnetic molten metal supply system, and more particularly to an electromagnetic molten metal supply system for maint~i~;ng the surface height of molten metal in a molten metal maint~ining furnace to a fixed height by controlling a dip type of cylinder electromagnetic pump and reducing variation of the quantity of the molten metal supplied.
BACRGROUND OF 'ln~ lNv~lloN
1. Field of the Invention The present invention relates to an electromagnetic molten metal supply system, and more particularly to an electromagnetic molten metal supply system for maint~i~;ng the surface height of molten metal in a molten metal maint~ining furnace to a fixed height by controlling a dip type of cylinder electromagnetic pump and reducing variation of the quantity of the molten metal supplied.
2. Description of the Related Art AS a conventional electromagnetic molten metal supply system, the one having the structure illustrated in Fig. 2 has been known. Referring to Fig. 2, in the molten metal maintaining furnace 1 in which a fixed quantity of molten metal i5 contained, a dip type cylinder electromagnetic pump 2 is disposed. The exciting current to be supplied to an exciting coil 3 of the electromagnetic pump 2 is regulated by a controller 4 and a molten metal surface detecting signal is supplied from a molten metal surface detecting instrument 5 to this controller 4. Further, the electromagnetic pump 2 is connected to a molten metal supply tube 6, the supply outlet of which is communicated with the injection sleeve 7 of a die cast machine. The reference numeral 8 in Fig.
,.,, . ~
i ) 2 is an injection plunger of the die cast machine.
In the above structure, the exciting current for maintaining the molten metal surface at a certain level is supplied from the controller 4 to the excitation coil 3 of the electromagnetic pump 2 in response to the output signal supplied from the molten metal surface detecting instrument 5, thereby the water head H between the level L1 of the molten metal surface in the molten metal supply tube 6 and the molten metal surface level of the furnace 1 is controlled so as to be constant. On the other hand, in a molten metal supply cycle, by changing the current being supplied to the exciting coil 3 through the controller 4, the molten metal is supplied up to a predetermined level L2 of the injection sleeve 7. Moreover, the molten metal thus supplied is injected in the die cavity to the die cast machine (not shown) by the displacement of the injection plunger 8.
Thus, since the conventional electromagnetic molten metal supply system is designed to change the current directed to the exciting coil 3 alternatively when controlling the molten metal surface level of the furnace 1 and controlling the molten metal supply quantity, it is difficult to keep the molten metal surface level constant with accuracy while supplying the molten metal, which has caused the variation of the ~. .
... .
-supply quantity and the deterioration of the molding stability of the die cast products.
To solve the above problems, it may be attempted to employ a furnace where the molten metal surface is kept constant or to maintain the molten metal surface constant with the provision of a separate electromagnetic pump. In this case, however, considerable increase in equipment cost becomes unavoidable.
SUMMARY OF THE INv~NlION
An object of the present invention is to provide an electromagnetic molten metal supply system for supplying a fixed quantity of molten metal constantly while precisely maintaining a molten metal surface by controlling the molten metal surface of a molten metal maintaining furnace and the molten metal supply separately by a single electromagnetic pump.
To attain the above object, the electromagnetic molten metal supply system according to the present invention has an electromagnetic pump for supplying a fixed quantity of molten metal contained in the molten metal maintaining furnace through a supply tube. The device includes an exciting coil of the electromagnetic pump which is divided into a first exclusive coil for maintaining the surface of the ~olten metal in the furnace and a second exclusive coil ~ ., , for supplying the molten metal so that these coils are separately controlled.
According to the present invention, by exciting the first exclusive coil for maintaining the surface of the molten metal, the output of the pump is used to control and maintain the molten metal surface precisely, and by exciting the second exclusive coil for supplying the molten metal, the output of the pump is used to control the supply of the fixed quantity of the molten metal.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a schematic block diagram showing one embodiment of an electromagnetic molten metal supply system according to the present invention.
Fig. 2 is a schematic block diagram showing a conventional electromagnetic molten metal supply system.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to Fig. l, an embodiment of the present invention will be described. The reference numerals used in the conventional example of Fig. 2 are used to designate like parts in the embodiment of Fig.
1 so that the description is simplified.
In Fig. 1, a plurality of exciting coils forming a cylindrical electromagnetic pump 12 immersed in a molten metal maintaining furnace 1 are divided in "~ ,, two groups of coils 3A and 3B: one group of coils 3A is used as a first exclusive coil for maintaining the molten metal surface in the furnace 1 and the other group 3B is used as a second exclusive coil for supplying the molten metal.
The aforementioned two groups of coils 3A and 3B are each connected to separate control devices, 4A
and 4B respectively. More specifically, the group of coils 3A for maintaining the molten metal surface are connected to a control device (invertor) 4A for maintaining the molten metal surface, whereas the group of coil 3B for supplying the molten metal is connected to a control device (invertor) 4B for supplying the molten metal. Further, the control device 4A for maintaining the molten metal surface and the control device 4B for supplying the molten metal are connected through an interface 12 to the controller 11 having incorporated therein a microcomputer.
A molten metal surface detecting instrument 5 for detecting a molten metal level in the molten metal maintaining furnace 1 in this embodiment has a float 5A
provided with a detecting bar 5B. The vertical displacement of the detecting bar 5B is detected by a potentiometer 5C. The signal of the molten metal level detected by the molten metal surface detector 5 is supplied to the controller 11 after A/D conversion through an amplifier 13. Incidentally, the reference -numeral 15 in Fig. 1 shows an AC three-phase power supp ly .
Based on the output signal from the molten metal surface detecting instrument 5, the controller 11 supplies first control signals regulating the predetermined exciting current of the group of coil 3A
for maintaining the molten metal surface to maintain the water head H. The controller 4A for maintaining the molten metal surface is controlled through the interface 12 by the output of the controller 11, whereby the exciting current necessary for maintaining the molten metal surface is supplied to the group of coils 3A.
Further, when a molten metal supply command control signal is supplied from the controller 11 to regulate the exciting current of the group of coils 3B
for supplying the molten metal, the exciting current is supplied and adapted, for instance, to supply a fixed quantity of molten metal in the injection sleeve 7 by controlling a fixed exciting current for a given period of time. Moreover, the pump output responsive to the first exclusive coil for maintaining the surface of the molten metal is set larger than the pump output responsive to the second exclusive coil for supplying the molten metal.
When the supply of the molten metal is completed, the subsequent command causes the injection -plunger 8 to advance to inject the molten metal into the cavity of the die cast machine.
According to this embodiment, it is possible to use a standard energy saving type molten metal maintaining furnace without the need for an expensive furnace for constantly maintaining the molten metal surface, and it is possible to control the maintenance of the molten metal surface and the supply of the molten metal separately by means of a single electromagnetic pump, so that the effect of avoiding the variation of the supply quantity of the molten metal and obtaining superior die cast products can be achieved.
In addition, without increasing the cost for providing devices for controlling the respective group of coils 3A and 3B, the aforementioned effects can be attained with a simple constitution.
Further, in the above embodiment, the molten metal surface detecting instrument 5 is not limited to the structure illustrated and is replaceable with any other kind having the same function as the instrument 5.
Moreover, the first and second exclusive coils may be interchanged and the number of coils may be set arbitrarily.
As has been described above, according to the present invention, it is possible to provide an :
i, .. ..
electromagnetic molten metal supply system which can precisely maintain the molten metal surface and supply a fixed quantity of molten metal constantly by separately controlling the molten metal surface of the molten metal furnace and the supply of the molten metal by means of a single electromagnetic pump.
,.,, . ~
i ) 2 is an injection plunger of the die cast machine.
In the above structure, the exciting current for maintaining the molten metal surface at a certain level is supplied from the controller 4 to the excitation coil 3 of the electromagnetic pump 2 in response to the output signal supplied from the molten metal surface detecting instrument 5, thereby the water head H between the level L1 of the molten metal surface in the molten metal supply tube 6 and the molten metal surface level of the furnace 1 is controlled so as to be constant. On the other hand, in a molten metal supply cycle, by changing the current being supplied to the exciting coil 3 through the controller 4, the molten metal is supplied up to a predetermined level L2 of the injection sleeve 7. Moreover, the molten metal thus supplied is injected in the die cavity to the die cast machine (not shown) by the displacement of the injection plunger 8.
Thus, since the conventional electromagnetic molten metal supply system is designed to change the current directed to the exciting coil 3 alternatively when controlling the molten metal surface level of the furnace 1 and controlling the molten metal supply quantity, it is difficult to keep the molten metal surface level constant with accuracy while supplying the molten metal, which has caused the variation of the ~. .
... .
-supply quantity and the deterioration of the molding stability of the die cast products.
To solve the above problems, it may be attempted to employ a furnace where the molten metal surface is kept constant or to maintain the molten metal surface constant with the provision of a separate electromagnetic pump. In this case, however, considerable increase in equipment cost becomes unavoidable.
SUMMARY OF THE INv~NlION
An object of the present invention is to provide an electromagnetic molten metal supply system for supplying a fixed quantity of molten metal constantly while precisely maintaining a molten metal surface by controlling the molten metal surface of a molten metal maintaining furnace and the molten metal supply separately by a single electromagnetic pump.
To attain the above object, the electromagnetic molten metal supply system according to the present invention has an electromagnetic pump for supplying a fixed quantity of molten metal contained in the molten metal maintaining furnace through a supply tube. The device includes an exciting coil of the electromagnetic pump which is divided into a first exclusive coil for maintaining the surface of the ~olten metal in the furnace and a second exclusive coil ~ ., , for supplying the molten metal so that these coils are separately controlled.
According to the present invention, by exciting the first exclusive coil for maintaining the surface of the molten metal, the output of the pump is used to control and maintain the molten metal surface precisely, and by exciting the second exclusive coil for supplying the molten metal, the output of the pump is used to control the supply of the fixed quantity of the molten metal.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a schematic block diagram showing one embodiment of an electromagnetic molten metal supply system according to the present invention.
Fig. 2 is a schematic block diagram showing a conventional electromagnetic molten metal supply system.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to Fig. l, an embodiment of the present invention will be described. The reference numerals used in the conventional example of Fig. 2 are used to designate like parts in the embodiment of Fig.
1 so that the description is simplified.
In Fig. 1, a plurality of exciting coils forming a cylindrical electromagnetic pump 12 immersed in a molten metal maintaining furnace 1 are divided in "~ ,, two groups of coils 3A and 3B: one group of coils 3A is used as a first exclusive coil for maintaining the molten metal surface in the furnace 1 and the other group 3B is used as a second exclusive coil for supplying the molten metal.
The aforementioned two groups of coils 3A and 3B are each connected to separate control devices, 4A
and 4B respectively. More specifically, the group of coils 3A for maintaining the molten metal surface are connected to a control device (invertor) 4A for maintaining the molten metal surface, whereas the group of coil 3B for supplying the molten metal is connected to a control device (invertor) 4B for supplying the molten metal. Further, the control device 4A for maintaining the molten metal surface and the control device 4B for supplying the molten metal are connected through an interface 12 to the controller 11 having incorporated therein a microcomputer.
A molten metal surface detecting instrument 5 for detecting a molten metal level in the molten metal maintaining furnace 1 in this embodiment has a float 5A
provided with a detecting bar 5B. The vertical displacement of the detecting bar 5B is detected by a potentiometer 5C. The signal of the molten metal level detected by the molten metal surface detector 5 is supplied to the controller 11 after A/D conversion through an amplifier 13. Incidentally, the reference -numeral 15 in Fig. 1 shows an AC three-phase power supp ly .
Based on the output signal from the molten metal surface detecting instrument 5, the controller 11 supplies first control signals regulating the predetermined exciting current of the group of coil 3A
for maintaining the molten metal surface to maintain the water head H. The controller 4A for maintaining the molten metal surface is controlled through the interface 12 by the output of the controller 11, whereby the exciting current necessary for maintaining the molten metal surface is supplied to the group of coils 3A.
Further, when a molten metal supply command control signal is supplied from the controller 11 to regulate the exciting current of the group of coils 3B
for supplying the molten metal, the exciting current is supplied and adapted, for instance, to supply a fixed quantity of molten metal in the injection sleeve 7 by controlling a fixed exciting current for a given period of time. Moreover, the pump output responsive to the first exclusive coil for maintaining the surface of the molten metal is set larger than the pump output responsive to the second exclusive coil for supplying the molten metal.
When the supply of the molten metal is completed, the subsequent command causes the injection -plunger 8 to advance to inject the molten metal into the cavity of the die cast machine.
According to this embodiment, it is possible to use a standard energy saving type molten metal maintaining furnace without the need for an expensive furnace for constantly maintaining the molten metal surface, and it is possible to control the maintenance of the molten metal surface and the supply of the molten metal separately by means of a single electromagnetic pump, so that the effect of avoiding the variation of the supply quantity of the molten metal and obtaining superior die cast products can be achieved.
In addition, without increasing the cost for providing devices for controlling the respective group of coils 3A and 3B, the aforementioned effects can be attained with a simple constitution.
Further, in the above embodiment, the molten metal surface detecting instrument 5 is not limited to the structure illustrated and is replaceable with any other kind having the same function as the instrument 5.
Moreover, the first and second exclusive coils may be interchanged and the number of coils may be set arbitrarily.
As has been described above, according to the present invention, it is possible to provide an :
i, .. ..
electromagnetic molten metal supply system which can precisely maintain the molten metal surface and supply a fixed quantity of molten metal constantly by separately controlling the molten metal surface of the molten metal furnace and the supply of the molten metal by means of a single electromagnetic pump.
Claims (3)
1. An electromagnetic molten metal supply system comprising:
a supply tube;
an electromagnetic pump, disposed in a furnace, for maintaining molten metal and for supplying a fixed quantity of molten metal through the supply tube, said pump including an exciting coil arrangement comprising a first exclusive coil for maintaining a surface of the molten metal in the furnace and a second exclusive coil for supplying the molten metal;
a first control device for controlling the first exclusive coil;
a second control device for controlling the second exclusive coil; and a controller for supplying first and second control signals to said first and second control devices, said controller regulating a predetermined exciting current in accordance with the surface of the molten metal.
a supply tube;
an electromagnetic pump, disposed in a furnace, for maintaining molten metal and for supplying a fixed quantity of molten metal through the supply tube, said pump including an exciting coil arrangement comprising a first exclusive coil for maintaining a surface of the molten metal in the furnace and a second exclusive coil for supplying the molten metal;
a first control device for controlling the first exclusive coil;
a second control device for controlling the second exclusive coil; and a controller for supplying first and second control signals to said first and second control devices, said controller regulating a predetermined exciting current in accordance with the surface of the molten metal.
2. A system as defined in claim 1, wherein pump output responsive to the first exclusive coil is set larger than pump output responsive to the second exclusive coil.
3. A system as defined in claim 1, wherein the controller is adapted for at least receiving a detected signal indicative of the molten metal surface.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63082758A JP2652656B2 (en) | 1988-04-04 | 1988-04-04 | Electromagnetic water heater |
| JP63-82758 | 1988-04-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1337015C true CA1337015C (en) | 1995-09-19 |
Family
ID=13783341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000595500A Expired - Fee Related CA1337015C (en) | 1988-04-04 | 1989-04-03 | Electromagnetic molten metal supply system |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2652656B2 (en) |
| KR (1) | KR910007679B1 (en) |
| CA (1) | CA1337015C (en) |
-
1988
- 1988-04-04 JP JP63082758A patent/JP2652656B2/en not_active Expired - Lifetime
-
1989
- 1989-04-01 KR KR1019890004299A patent/KR910007679B1/en not_active IP Right Cessation
- 1989-04-03 CA CA000595500A patent/CA1337015C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2652656B2 (en) | 1997-09-10 |
| JPH01255467A (en) | 1989-10-12 |
| KR910007679B1 (en) | 1991-09-30 |
| KR890015804A (en) | 1989-11-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |