Process for casting molten metal

Metal founding – Process – With measuring – testing – inspecting – or condition determination

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Details

164 37, 164136, 164335, 164363, B22D 3504

Patent

active

048321117

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a process and apparatus for casting molten metal wherein a casting mold containing molding material and a runner gate formed in the molding material is filled from a melt container having at least one pouring lip having a closable outlet.
It is known in the prior art to employ metering devices for controlling the flow of molten metal to a casting mold. In order to avoid the expense of a metering device, which also requires appropriate maintenance, German Patent DE-PS 2,811,055 discloses that a melt container can be placed with its pouring lip directly onto the casting mold or the mold material contained therein, with the interposition of a separating element therebetween. The separating element can be of various different designs, such as a funnel-shaped element, lying on the mold material in a corresponding depression and opening out at its lower funnel end into the gate of the casting mold. The separating element can also be pot-shaped or be designed in any other suitable manner and arranged in a a corresponding depression.
The object of the present invention is to simplify this casting process by eliminating separating elements while achieving a higher metal yield.


SUMMARY OF THE INVENTION

The foregoing object is achieved by the present invention wherein a process for casting molten metal from a melt container to a mold cavity defined by a molding material comprises providing a gate in the molding material for communicating a runner gate with the mold cavity, compressing the molding material in the region of the runner gate whereby the molding material in the region is denser with respect to the rest of the molding material, providing the melt container with a pouring lip having a closeable outlet, an outlet bore and a profiled lower surface projecting from the melt container, sealing the profiled lower surface on the molding material in the region of the runner gate, and feeding molten metal from the melt container through the outlet and said outlet bore in the pouring lip to the runner gate, gate and mold cavity such that the liquid level of the molten metal in the melt container decreases during the casting operation. The present invention includes an apparatus for carrying out the process.


BRIEF DESCRIPTION OF THE DRAWINGS

The invention is explained in greater detail below with reference to the drawings wherein
FIG. 1 shows a vertical section through the diagrammatically represented device for casting, in a position before the filling of the casting mold and
FIG. 2 shows the device shown in FIG. 1 in the position following the filling of the casting mold.


DETAILED DESCRIPTION

According to FIGS. 1 and 2, the melt container 1 has at its base a pouring lip 2 having the outlet bore 3, which extends through the latter and, together with a stopper rod 4, which can be vertically displaced using a drive means (not shown in the drawing), forms the closeable outlet 5. At that end of the pouring lip 2 which projects downwards beyond the base of the melt container, the pouring lip 2 has a level or profiled lower surface 6.
The casting mold 7 contains mold material 8 in which a mold cavity 9 to be filled with molten metal is formed. The runner gate 10 at the top of the casting mold is connected to the mold cavity 9 via the gate 11. In a region 12 surrounding the runner gate 10, the molding material 8 is more highly consolidated. This extra consolidation is preferably effected by increased compaction of the mold material. A depression 13 is then formed in this more highly compacted region 12, preferably being produced by milling in or forming in and at the base of the depression having a surface 14 which is brought into surface contact with the lower side 6 of the pouring lip 2 during casting. To avoid excessive loading and possible breaking off of the mold material by the contact forces between the mold and the outlet in the recompacted area, the surface 14 of the depression 13 can and preferably is profiled or made such that it slopes slightly upwar

REFERENCES:
patent: 3256571 (1966-06-01), Lund
patent: 4205721 (1980-06-01), Jorn et al.

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