SU582891A1 - Centrifugal casting machine with vertical axis of rotation - Google Patents

Description

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The invention relates to the field of foundry, in particular to equipment for centrifugal casting.

The known machine for centrifugal casting of castings with a vertical axis of rotation, in which the metal reservoir is made in the form of a container with a pipe in the bottom, facing the inside of the container, and is fixed in the lower part of the mold {). This machine has the following disadvantages. To set the dose of metal, it is necessary to immerse the metal receiver in the liquid metal. In this case, the metal enters the metal reservoir from the upper contaminated metal layers of the transfer furnace and this causes the casting to reject nonmetallic inclusions, oxide films, etc. In addition, the transfer furnace must be moved in a vertical plane using a special drive. The time required to immerse the metal reservoir in the dispensing furnace lowers the productivity of the process.

The purpose of the invention is to improve the quality of castings, simplify the design and increase the productivity of centrifugal machines.

This is achieved by the fact that the machine is equipped with an installation for supplying metal under low pressure through the metal pipe into the intermediate bowl, to which the latter is rigidly connected, the intermediate bowl being heated and open at the top, where the metal receiver is freely located with a gap.

The drawing shows a schematic diagram of a centrifugal casting machine with a vertical axis of rotation.

The machine contains a1t unit 1 for supplying metal under low pressure with a metal pipeline 2, which is rigidly attached to an intermediate, open-top heated stationary hardened bowl 3. In the internal volume of the bowl is placed a metal receiver 4 with a nozzle 5 with a gap of 3-5 cm for a dose and ensuring the smooth adherence of the metal receiver to the mold after discharge of excess metal. The metal receiver 4 is attached to the bottom half-form 6. As a part, choose a short-circuited rotor 7 of the electric motor, the iron packs of which are placed between the lower half-form 6 and the upper half-form 8. The cast-on form has a horizontal connector and is rotated with a metal-receiving 4 using an electric motor (not shown ).

The machine works in the following way. By raising the upper mold half into the lower mold 6, the same-level packages will prevent the rotor 7. By means of adjustable overpressure, liquid metal from the plant is fed through metal conduit 2 into the intermediate bowl 3, which is permanently attached to the fixed frame of the machine for centrifugal casting {in the drawing not shown) and is electrically heated to provide the required temperature of the liquid metal fed to it and the metal receiver 4 is heated through pipe 5. The volume between the walls of the pipe and the metal receiver corresponds to For details of the dose. The height of the metal in the bowl 3 exceeds the height of the pipe 5 by 3-4 cm. After the excess pressure has been released, the excess metal flows through the metal pipe 2 into the installation I. Supply of metal to the mold under low pressure provides a dose from the lower metal layers in the crucible. This eliminates nonmetallic inclusions, oxide films and others in castings and improves the quality of the casting. In addition, a low-pressure dose delivery shortens the casting production cycle and increases the machine productivity by 10–15%.

After a dose of metal is fed into the metal receiver and the discharge from the chucks into the low-pressure casting unit, the motor is rotated and the liquid metal is filled by the rotor 7 due to centrifugal forces. . After inspecting the half-molds from the cleaning and, if necessary, coloring, the process can be repeated.

The proposed machine is simpler in design, the productivity of its S is increased by 10-15% and the quality of the casting is improved by using the supply of metal under pressure and the collection of a dose from the lower metal layers.

Claims (1)

Invention Formula The machine for centrifugal casting with a vertical vertical axis of rotation, containing a metal reservoir, made in the form of a container with a nozzle in the bottom, facing the inside of the container, and reinforced in the lower part of the casting mold. We, characterized in that, in order to improve the quality of the castings, simplify the design and increase the productivity of the machine, it is equipped with an installation for supplying metal under low pressure through the metal conduit to the intermediate bowl, with which the latter connected, with the intermediate bowl being heated and open at the top, where the metal reservoir is freely located with a gap. Sources of information taken into consideration during the examination: I. Application No. 2184491/02, according to which a decision was made to issue an author's certificate, cl. B 22 D 13/04 // B 22 D 35/04, 1975.