DE2048328A1 - DEVICE FOR DELIVERING MOLTEN METAL FROM A FURNACE TO A CASTING MACHINE - Google Patents

Description

Pr 165Ü

GERITY-tSCHULTZ CORPORATION, TOLEDO / OHIO / USA

Device for dispensing molten metal from an oven to a casting machine

The invention relates generally to an automatic molding apparatus for a low pressure injection molding machine, a Cold chamber die casting machine or a continuous mold '

to water. The invention relates in particular to structural facilities that ensure that predetermined quantities molten metal are delivered coherently and evenly to the mold recesses of an injection molding machine.

Injection molding equipment conventionally includes a vertically or horizontally arranged mold stand, a plurality of spaced rods attached to one side of the mold stand on which a movable mold support member is arranged for reciprocating movement. In addition, a deck forming 1st on the rod side of the stationary Gußformständers arranged i and an injection mold is provided on the movable bracket on the side opposite the cover form over. The movable mold is mounted so that it is reciprocated against the stationary mold by hydraulic means, whereby the deck molds and injection molds are opened or closed in accordance with the injection molding cycle.

Previously, in the operation of cold chamber injection molding machines, the "loading" (filling) of the molten metal was done manually from the melting chamber to the charge tube (charge sleeve)

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at the end of the insertion cylinder and at the entrance of the casting mold recess brought for the subsequent injection molding process. With regard to the inefficiency, the poor results and on the dangers that the manual system presented, became semi-automatic and fully automatic devices designed by which the molten metal is attached to the tube of the injection molding machine for introduction into the mold cavity was delivered. Later the fully automatic machines were further improved; the particularly modern automatic ones Machines use structural equipment to automatically measure the amount of molten metal that is to be delivered to the loading sleeve or to the loading tube of the insertion cylinder near the mold recess.

These injection molding machines with automatic sizing devices however do not have the required performance and the required efficiency to deliver a precisely predetermined, constant amount of molten metal on the pipe. Tile most building efforts revolve around the use of an automatic scooping mechanism; with Vacuum-> air or gas pressure working conveying devices mounted so that they release to the charge tube an amount of molten metal greater than that in terms of the Capacity of the inlet channels to the mold recess and other material-consuming effects (such as overflow, burr, etc.) is required. As a result of such overcompensation, excess amounts of molten metal are transferred to the Discharge mold recess, which has undesirable consequences such as excessive amounts of overflow; an overflow amount or an insufficient amount of molten metal in the mold cavity deteriorates performance and the efficiency in injection molding. Furthermore, there is usually a single pump that is used to deliver molten metal to the cargo tube is used, unable to provide the exact and equal- * the remaining amount of molten metal contained in the

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Mold recess is required. This problem arises from the fact that the charge cylinder pump usually operates by gravity flow or other associated pressure sources to fill the charge cylinder, as evidenced by the varying metal level of the supply furnace. £ rd ^e §enutzt to fill especially the gravity and the pressure of the molten metal itself w to the charge cylinder; often the combination of gravity and pressure is insufficient or insufficient to completely fill the charge cylinder. Very often therefore operate the pressure medium or other facilities that are used for filling the charge cylinder, insufficient or un- i exactly to fill the single pump, which makes it impossible for the pump, the predetermined amount of melted to the charge tube metal as is requested by the pump capacity.

The invention is therefore based on the object of designing a device of the type mentioned in such a way that precisely predetermined, coherent amounts of molten metal are delivered to the tube (sleeve) of the mold cavity, the device being simplified by a particularly reliable mode of operation, high productivity and Design 'should distinguish.

This object is achieved according to the invention in that an at least partially submerged below the surface level (fill level) of the molten metal in the furnace, a first, a second and a third chamber having a housing is provided in which a first chamber with the molten metal connecting inlet and in which a first connecting channel is also located between the first and the second chamber and a second connecting channel between the second and the third chamber are provided, the housing also having an outlet as a connection between the third chamber and the casting machine

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has, and that for the purpose of delivery iron gesctomolzefiem Metmll the furnace to the casting machine in the first one mud lsi the third Chamber of the case a Piimpeiie: lnrle & tiing vot ^ gesebeia

In addition to the advantages mentioned above, the device according to the invention also avoids oxidation of the total metal due to the nature of the reservoir; Qxyae and inclusions float, so that only clean metal is fed to the charge tube or the cavity. The device according to the invention also results in a comparatively safe casting arrangement for an injection molding machine,

An exemplary embodiment of the invention is explained in more detail below with reference to the drawing. Show it

Pig.l is a partially sectioned side view of a device according to the invention;

Fig.2 is a partially sectioned side view of the device illustrated in Pig.

This invention includes an automatic molding apparatus for an injection molding machine. This embodiment contains a horizontally arranged storage furnace with an outer casing made of suitable refractory materials; in the molten metal, which is in this supply furnace, a pressure chamber is fixedly arranged, which a has located in her two-cylinder pumping device. This pumping device is arranged to take the molten metal from the supply furnace into and from the pressure chamber pumps into a passage opening, which is in a Gooseneck is located with one in the line of the mold recess is connected to the cargo tube. The pipe stands in with the end of a hydraulic cylinder Connection, which acts as a final pressure device for the introduction

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of the molten metal into the mold cavity from the pipe is used from.

In Fig.l of the illustrated in the drawing according to the invention Embodiment is a storage furnace 10 or a reservoir for molten metal in about. horizontal arrangement shown. In the supply furnace 10 there is molten metal, the level of which is generally is designated by 12. The supply furnace 10 includes not shown Heating devices that keep the metal in a molten state. The walls of the supply oven 10 are made of refractory material that is able to withstand high temperatures for relatively long periods of time to endure.

In the supply furnace 10, a multi-chamber housing 14 is arranged with vertical, spaced-apart side walls 16 and 18 which act to suck molten metal from the supply furnace 10 in order to pump it into the mold recesses. A gooseneck-like connecting piece 20, which is connected to the interior of the housing 14 and has an inner feed-through opening 22, is connected to the bottom of the side wall 16. The upper end of the fitting 20 is connected to a tubular grommet 24 which in turn communicates with a tube 25 at the entrance of the not illustrated mold recess. Within the housing 14 there are two vertically arranged cylinders 26 and 28 which form a chamber 30 arranged between them. Both cylinders 26 and 28 have wall coverings made of graphite or other suitable refractory material for the purpose of retaining the molten metal in its heated state. Within each cylinder 26 and 28 there is a piston 32 and 34, respectively, which are mounted so that they are in the cy- ^ ;. _: . relieve move back and forth on a predetermined distance, * ·: ,,;: For the cylinder 28, it is characteristic that it has a larger

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Diameter than the cylinder 26 has. It is polar Volume of molten metal »that through the cylinder 28 can be pumped, greater than that which can be pumped through the cylinder 26.

From the upper parts of the pistons 32 and 34 extend vertically arranged rods 36 and 38, which for the purpose of common Movement are firmly connected to the piston. The rods 36 and 38 are in turn fixed at their upper ends a horizontally arranged cross brace 40 connected; namely, the rod 36 is at one end of the cross brace 40 and rod 38 at the opposite end of the cross brace 40 using conventional types of attachment.

The vertically arranged piston rod 42 of a pressure medium drive 44 is fastened to the cross brace 40 in a suitable manner. The pressure medium drive 44 is fastened in such a way that the piston rod 42 can move the cross brace 40 relative to the furnace 10 when it is actuated.

From the foregoing it is easy to understand that each time the pressure medium drive 44 is actuated for the purpose of downward movement of the piston rod 42, the cross brace 40 is moved downwards, whereby the rods 36 and 38 also move the same vertical distance downwards and thus at the same time a downward movement of the pistons 32 and 34 in cylinders 26 and 28, respectively. It can be seen that the pistons in each cylinder move down an equal vertical distance simultaneously, resulting in an equal relative displacement in each cylinder 26 and 28. · ...:.; ·. ■; ■■■ '. <■>. ·. ■ .- ■::; ■ - ■

Between the cylinders W 'and 28' ^: 'fst a chamber 50 arranged centrally in the housing 14 /' At the bottom of the cylinder 28 and the upper part ¹ 'dW ^ fCairimer $ 0 · there is an approximately vertically arranged;' αϊβ ^ν % ΐΦάβιι connecting cylinder

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de channel-like passage opening 52. In addition, the cylinder 28 provided with an inlet opening §6, which from the inside of the Oven 10 through the vertical wall 18 of the housing 14 directly the inside of the cylinder 28 leads. To establish a connection between of the central chamber 50 and the interior of the cylinder, an inlet port 58 is provided.

The implementation opening 22 of the connecting piece 20 provides a connection between an outlet opening 60 of the cylinder 26 and the inlet of the spout 24. The spout 24 can be electrical be heated, for example to ensure a smooth flow of molten metal. The spout 24 leads directly to the tube 25 of the mold recess of an injection molding furnace or a Injection molding machine.

During operation, molten metal is from the supply so far 10 into the chamber 14 through the inlet port 56 due of the partial vacuum effect created by the retraction of the piston 34. If then the hydraulic piston rod 38 is lowered, it is melted Metal from cylinder 28 into through hole 52 and pressed from there into the central chamber 50. During the following stroke, the rise of the piston 32 in the cylinder 26 causes the molten metal of the central chamber 50 through the inlet port 58 and flows into cylinder 26. When the piston 32 is brought down after molten metal into the cylinder 26 has flowed, the inlet port 58 is closed by the piston 32; the molten metal is made from the Cylinder 26 up through the passage opening 22 of the The connector 20 is pressed into the spout 24 and from there into the recess associated with it.

- The structural ratio (which makes the cylinder 28 larger is ensured as the cylinder 26) that the interior of the cylinder 28 and thus the,! central chamber 50 always more molten Material than the capacity of the cylinder

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26, which introduces the molten metal into the mold cavity. This ensures that the cylinder 26 is always full, so that a constant metal fill level 12 is maintained, whereby a constant amount of molten metal is introduced into the associated mold cavity will. The mold recess is therefore always with a coherent, precise one during each dispensing cycle Amount of molten metal filled regardless of the metal level 12 in the furnace 10.

The structural arrangement of the double pump device in the housing 1H therefore shows that the cylinder 26 will always be completely filled, since the molten metal conveyed into the cylinder 26 is received by the stationary container for molten metal in the central chamber 50. Any excess of metal that is conveyed through the KoIt ben 3 ^ into the chamber 50 is drawn off through overflow channels 66 (see FIG. 2); a constant metal fill level in the reservoir chamber 50 is therefore maintained.

It is to be understood that the main part of the housing is preferably made of a suitable ceramic, refractory material, the inner walls of the cylinders 26 and 28 being provided with sleeves of wear-resistant material in order to provide the necessary close fit with the outer walls of the pistons 32 bzvr, J> k .

Claims (1)

- 9 claims 1.) Device for dispensing molten metal from an oven to a casting machine, thereby characterized in that an at least partially below the surface level (fill level) of the molten metal in the furnace, a first, a second and a third Chamber having a housing is provided in which there is a first chamber with the molten metal connecting inlet is located and in which a first connecting channel between the first and the second Chamber and a second connecting channel between "the second and the third chamber are provided, wherein furthermore the housing has an outlet as a connection between the third chamber and the casting machine, and that for the purpose of delivering molten metal from the furnace to the casting machine in the first and in a pump device is provided in the third chamber of the housing. 2.) Device according to claim 1, characterized in that the inlet in the housing is below the level of the molten metal contained in the furnace. 3.) Device according to claim 2, characterized in that the first connecting channel from the lower part of the first Chamber extends to the upper part of the second chamber. Jj.) Device according to claim 2, characterized in that the first connecting channel from the lower area of the first chamber bi3 in the upper area of the second chamber, up to above the level of the one in the furnace molten metal extends. 109815/1 /, 65 - ίο - 5.) Device according to claim 3> characterized in that that-the second connecting channel below the outlet opening of the first connecting channel is arranged in the second chamber. 6.) Device according to claim 5 »characterized» that the pump device has pistons located in the first and in the second chamber. 7.) Device according to claim 6, characterized in that the piston device has a pressure medium drive for the purpose of producing a simultaneous reciprocating movement of the pistons. 109815 / U65 Blank page