SU943310A1 - Apparatus for filtering molten metals before pouring into mould - Google Patents

Description

one

The invention relates to the metallurgy of non-ferrous and ferrous metals and is intended for use in refining and filtration processes of metals and alloys using ultrasonic and electromagnetic processing.

A device for filtering liquid metals and alloys is known, which contains a tank, electrodes, an electromagnet, and a filter in the form of a flattened tube with ultrasound emitters, the electrodes and ultrasound emitters in contact with the filtering metal G1 .ts

The disadvantages of this device are difficulty in operation, cooling of the metal due to contact with ultrasound emitters, difficulty in cleaning the pipe walls due to the structural complexity of inserting electrodes and emitters into the pipe, which leads to insufficient filtration quality and frequent stops.

The purpose of the invention is to increase the filtration efficiency, simplifying the operation of the device.

The goal is achieved by the fact that in the device the electrodes are made in the form of rods, each of which is fixed inside the pipe along the narrow side using a current-carrying holder installed above the level of the metal being filtered, and the emitters are mounted in pairs with their waveguides resting on mutually opposite walls on the outside tubes below the electrodes.

Due to such an embodiment of the device, the cleaning of the pipe and the preparation of the filter for operation are simplified, and the cooling of the metal is reduced when in contact with the ultrasound emitters, which contributes to an increase in the quality of filtration.

Claims (1)

FIG. 1 shows a device for filtering liquid metals and alloys, a general view; in fig. 2 3 section A-A in FIG. one; in fig. 3 section bb in fig. one; on. FIG. 4 shows a section B-B in FIG. 1. The device contains a capacitance 1, electrodes 2 and 3, an electromagnet k with support posts 5 and 6 and a tube 7 with ultrasound emitters 8 and 9. The capacitance 1, supported through the heat insulating inserts 10 on the nitrile electrode 4, is welded to the upper part of the pipe. 7. The lower part of the pipe 7 is closed by an insert 11 with an opening 12 to exit the filtered metal. The insert 11 by means of nuts 13 and bolts 14 is pressed against the end of the pipe 7l with the latter a tight connection. The electrodes 2 and 3 are made in the form of round rods attached along the narrow walls of the pipe 7 with the help of current-carrying holders 15 and 16 connected to a constant electric current source. In the upper part, electrodes 2 and 3 are insulated from the metal being filtered by ceramic bushes 17 and 18. Ultrasound emitters 8 and 9 are mounted in pairs with their waveguide 19 and 20 resting into the mutually opposite walls of tube 7 below electrodes 2 and 3. The working surfaces of waveguides 19 and 20 are made of spheres perfect; The necessary force of their clamping in the pipe 7 is provided by springs 21 and 22. Preferably, magnetic converters are used as emitters. Electromagnet 4 is connected to a DC source, and ultrasound emitters 8 and 9 are connected to a high frequency AC source. The device works as follows. The material to be filtered is poured into vessel 1, includes sources of direct and alternating current, and supplies voltage to electrodes 2 and 3, electromagnet 4 and ultrasound emitters 8 and 9. From vessel 1, the metal flows into pipe 7 and through opening 12 is drained in the crystal mash. The level of the metal in the tank 1 must be maintained at a constant height in order to avoid fluctuations in the speed of the metal jet at the outlet of the hole 12.. When electric current is passed through electrodes 2 and 3 and the electromagnet k is being filtered metal, at 4 ° walking in the zone of the electromagnet poles, electromagnetic pressure forces appear that weaken the metal compared to nonmetallic particles like oxide films and slag inclusions and promote the ascent of the latter . Nonmetallic particles released from the metal accumulate in the capacitance 1. When electric current is passed through the windings of the ultrasound emitters 8 and 9, the waveguides 19 and 20 and the walls of the tube 7 oscillate, and as a result, an ultrasonic field forms in the filtered metal below electrodes 2 and 3. Under the action of an ultrasonic field from the filtered metal, the microvolumes of the gas dissolved in it are released, which enhances the filtering effect. In this case, numerous active crystallization centers appear in the metal flow, which leads to the formation of a fine-crystalline structure of the cast metal casting. The use of the proposed device for filtering liquid metals and alloys provides, in comparison with known devices, the following advantages: simplifying its operation and improving the quality of filtration. Apparatus for filtering liquid metals and alloys before pouring into a mold containing a container, electrodes, an electromagnet and a flattened filter with an ultrasound emitter, characterized in that, in order to simplify operation and improve the quality of filtration, the electrodes are in the form of rods, each of which is fixed inside the pipe along the narrow side with the help of a current-carrying holder installed above the level of the metal being filtered, and the radiators are mounted in pairs with their wave stop odov in mutually opposite walls of the tube below the electrodes. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 555155, cl. C 22 B 9/02, 1977. WB Fig. J