Automatic molten metal supply and injection device

Details Automatic molten metal supply and injection device Automatic molten metal supply and injection device

1999-05-24

2001-05-15

Pyon, Harold (Department: 1722)

Metal founding

Means to shape metallic material

Pressure shaping means

C164S314000, C164S337000, C425S557000

Reexamination Certificate

active

06230786

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates to an automatic molten metal supply and injection device used for casting molten metal into a metallic mold or a mold for sand mold casting or for casting semihardened molten metal into a mold.
Automatic molten metal supply devices and injectors for casting molten metal into a mold are available in various types and structures.
FIGS. 7
to
9
show conventional automatic molten metal supply devices and injectors of different types.
The automatic molten metal supply device and injector shown in
FIGS. 7A-8B
includes a molten metal retaining furnace
1
having an outlet
2
to which is connected to the suction side of an electromagnetic pump
3
. In the furnace, the level of molten metal is kept constant. An upright injection cylinder
6
is provided under a pair of openable molds
4
,
5
. Split sleeves
7
and
8
are fixed to the bottom ends of the molds
4
and
5
, respectively. The discharge port of the electromagnetic pump
3
is connected to the sleeve
7
of the stationary mold
4
.
The molds
4
,
5
, which are initially open as shown in
FIG. 7A
, are closed as shown in
FIG. 7B
, and the electromagnetic pump
3
is activated to supply a required amount of molten metal from the furnace
1
into the now closed sleeves
7
,
8
. Then, as shown in
FIG. 8A
, the cylinder
6
is extended to supply molten metal from the sleeves
7
,
8
into a cavity of the molds
4
,
5
under pressure.
The cylinder
6
is then retracted as shown in
FIG. 8B
, and the molds
4
and
5
are opened,to remove the molded product.
The automatic molten metal supply device and injector shown in
FIGS. 9A-9C
includes a pair of openable molds
11
and
12
. A horizontal sleeve
14
communicating with the cavity
13
is fixed to one of the molds
11
and
12
. The sleeve
14
has a molten metal supply port at one end thereof. An injection plunger
16
is inserted in the sleeve
14
.
With this automatic molten metal supply device and injector, with the molds
11
,
12
closed, molten metal in the container
17
is poured through a molten metal supply port
15
into the sleeve
14
and supplied into the cavity
13
of the molds
11
,
12
under the pressure by the plunger
16
. The plunger
16
is then retracted, and the molds
11
,
12
are opened to remove the product.
These devices have a problem in that while molten metal is being supplied into the sleeve, an air layer tends to appear in the cavity, so that air tends to mix into the molten metal. This increases the possibility of pores being developed in the end product. Also, if a magnesium alloy is cast, air mixed into the molten magnesium alloy can cause explosion.
Also, in these conventional devices, molten metal can be supplied only after the molds have been closed. Working efficiency is thus low.
An object of this invention is to provide an integrated automatic molten metal supply and injection device which can prevent mixing of air into molten metal being supplied, which can reduce the possibility of explosion and the development of pores, and which makes it possible to supply molten metal irrespective of whether the molds are open or closed.
SUMMARY OF THE INVENTION
According to this invention, there is provided an automatic molten metal supply and injection device comprising a body having a molten metal passage for guiding molten metal, a sleeve having a molten metal suction port and a discharge port and adapted to be rotated for opening and closing communication between a molten metal passage of the body and the suction port, a first piston axially movably mounted in the sleeve for sucking molten metal into the sleeve by a predetermined amount through the suction port and extruding the thus sucked molten metal through the discharge port, and a second piston axially movably mounted in the first piston to extend therethrough for opening and closing the discharge port and pressurizing the molten metal through the discharge port, the first and second pistons being movable independently of each other.
Other features and objects of the present invention will become apparent from the following description made with reference to the accompanying drawings, in which:


REFERENCES:
patent: 5205338 (1993-04-01), Shimmell
patent: 5244033 (1993-09-01), Ueno
patent: 5698242 (1997-12-01), Chen et al.
patent: 5735333 (1998-04-01), Nagawa
patent: 49-28087 (1974-07-01), None

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