SU884851A1 - Apparatus for exciting vibration of melt - Google Patents

Description

one

The invention relates to metallurgy and can be used to produce ingots and castings, as well as to process crystallizing ingots or castings in metal molds, chills and in continuous casting.

A known vibratory installation for metal casting, comprising a casting trolley with molds and a vibrator consisting of a body-magnetic circuit, electromagnetic catholes and unbalance shafts l,

However, such devices are complex in design, making it difficult to use them in industry on a large scale.

The closest to the proposed technical essence and the achieved result is a device for exciting vibrations of a metal melt by elastic oscillations excited by electric current passing through thin channels due to the forces of the tightening effect, which contains a capacitance of an electrically conductive material with a partition having an aperture and Electron-conductive material, electrodes embedded in the tank, connection to the current source. The device is structurally simple and does not require bulky and expensive equipment 2.

However, such a device does not allow the metal to be processed in the process of ingot and casting crystallization.

The purpose of the invention is to provide the possibility of melt processing during the crystallization process. Improving the quality of castings and increasing the yield of the suitable one

This goal is achieved by the fact that a device for exciting melt vibration, containing a melt tank, a current source and electrodes supplied to the melt, is provided with a tube of electrically non-conducting material installed in the upper part

containers, and in the tube is mounted one of the electrodes.

FIG. 1 and 2, an apparatus for exciting a melt in the form of a metal container is shown.

The device consists of an electrically conductive metal container 1 with a melt 2, a removable tube 3 made of an electrically conductive material, installed in the upper part 4 of the container (or in the profitable part if the container is made as a mold), current source 5 and electrodes 6 and 7, one of which is mounted in the tube 3, and the second in the vessel wall (fig. O or in the siphon wiring channel (fig. 2).

The device works as follows.

After filling the vessel I, for example the cast-iron mold, with the melt 2, for example steel, into the profitable part 4

Install the tube 3 of an electrically non-conductive material, for example, an alundum. An electric current is passed through the melt 2, the inputs from the current source 5 through the electrodes, one of which (electrode 6) is mounted into tube 3, and the second (electrode 7) into the vessel wall 1.

The electric current flowing through the melt filling the internal cavity of tube 3 creates electromagnetic forces directed to its axis. The complete compression of the melt in tube 3 is accompanied by the breakdown of the electric circuit and the occurrence of a shock wave in the crystallizing melt 2, which leads to the mixing of the melt, breaking of the growing dendrites and transferring them by convective flow from the solidification boundary to the volume of the liquid core. This phenomenon contributes to the emergence of new centers of crystallization, reduction of chemical heterogeneity and improvement of the structure of the otlieki. The released heat energy during electric arc arc rocking at the moment of breaking the electric circuit provides additional heating of the profitable part of the casting, which contributes to better feeding of its axial zone during solidification and reduction of shrinkage defects.

PRI im p In laboratory conditions, a device is developed and tested to initiate elastic oscillations in a crystallizing copper ingot weighing 70 kg. The device consists of a current source, a steel mold 1, in the wall of which one of the electrodes is mounted, and the second is mounted in an alundum tube with a diameter of 10 mm. A current of 4000 A is passed through the melt for 1 min. The treatment with elastic vibrations allows to obtain a nylon macrostructure of the ingot.

The use of the proposed device will reduce the cut in rolling and reduce the marriage of the macrostructure.

Invention Formula

A device for exciting melt vibration, containing a tank for melt, embedded electrodes connected to a current source, characterized in that, in order to improve the quality of castings and increase the yield, it is equipped with a tube of electrically non-conducting material installed in the upper part of the tank, and in the tube is mounted one short-circuit electrodes.

Sources of information taken into account in the examination

1. USSR author's certificate number 341588, cl. B 22 D 7/12, 1972.

2. USSR author's certificate number 253314, cl. B 22 D 7/12, 1966,

Claims (1)

Claim A device for exciting the melt vibration ₃₀ containing a container. For the melt, electrodes built into it, connected to a current source, characterized in that, in order to improve the quality of castings and increase the yield, it is equipped with a tube of electrically conductive material, installed in the upper part of the tank, and one of the electrodes is mounted in the tube.