RU221449U1 - Device for feeding the melt into the crystallizer of a skull furnace - Google Patents

Abstract

The utility model relates to the field of electrometallurgy, in particular to the design of a device for feeding a melt into the crystallizer of a vacuum arc furnace for smelting ingots from highly reactive metals and alloys, mainly titanium. A device for supplying the melt to the crystallizer of a skull furnace, containing side and end walls forming a channel tapering downward; according to the utility model, a through hole is made on the front end wall with a detachable block installed in it, formed by two cylindrical segments that form an internal cavity of a cylindrical shape. The through hole on the front end wall is made with an outer taper mating with a chamfer, which is made at the end of the connector block. The parting plane of the cylindrical segments forming the detachable block is 120°. The opposite end of the connector block is closed by a flat flange under the action of fasteners. The technical result achieved by implementing the utility model is a reduction in the technological cycle for the production of ingots by eliminating the operation of mechanical processing of sampling from the smelted ingot.

Description

The utility model relates to the field of electrometallurgy, in particular to the design of a device for feeding a melt into the crystallizer of a vacuum arc furnace for smelting ingots from highly reactive metals and alloys, mainly titanium.

The main indicator of the quality of ingots is the compliance of the chemical composition with the specified one. To conduct a control chemical analysis, the smelted ingots are subjected to mechanical processing by drilling or cutting out samples of a certain shape. However, this significantly increases the technological cycle of ingot production. Therefore, it is advisable to obtain a sample for chemical control by pouring the metal into the crystallizer, which eliminates the operation of mechanical processing.

A device is known for feeding the melt into the crystallizer of a skull furnace, containing side walls forming a channel tapering downward, and a bottom; it is also equipped with an upper detachable ring liner with a vertical radial plane of the connector installed in a mounting hole made in the bottom, and a lower annular detachable locking liner , installed on the lower end of the upper annular detachable liner (RF patent for utility model No. 132446, IPC C25B 9/21, published 09/20/2013).

The known device does not have the ability to sample a portion of the liquid metal at the moment it is poured into the crystallizer.

The task to be solved by the utility model is to expand the technological capabilities of using the device, combining the operation of ingot smelting and sampling to determine the chemical composition.

The technical result achieved by implementing the utility model is a reduction in the technological cycle for the production of ingots by eliminating the operation of mechanical processing of sampling from the smelted ingot.

The technical result is achieved by the fact that the device for supplying the melt into the crystallizer of a skull furnace, containing side and end walls forming a channel tapering downwards, according to the utility model, a through hole is made on the front end wall with a detachable block installed in it, formed by two cylindrical segments that form the internal cavity is cylindrical in shape. The through hole on the front end wall is made with an outer taper mating with a chamfer, which is made at the end of the connector block. The parting plane of the cylindrical segments forming the detachable block is 120°. The opposite end of the connector block is closed by a flat flange under the action of fasteners.

The utility model is illustrated by drawings.

Figure 1 shows a general cross-sectional view of the device. In fig. 2 extension element A. In Fig. 3 view B. Figure 4 shows a diagram of removing the sample from the device.

The device for feeding metal into the mold contains side walls 1 and end walls 2, forming a channel 3 tapering downwards. In the lower part of the front end wall there is a hole 4 with a conical extension outwards, where a detachable block 5 is installed, formed by two cylindrical segments 6 and 7, having in cross section, the plane of the connector is 120°, and the narrowing 8 is at the point where it mates with the end wall 2. The segments of the connector block form an internal cylindrical cavity 9, and the end outer surface of the connector block is closed by a flat flange 10 under the force of fasteners 11.

The device works as follows.

Before melting begins, the device is assembled. The block segments are connected by a parting plane and the tapered surface is installed in the mounting hole of the front end wall of the device, then the outer end surface of the block is closed with a flat flange using fasteners. The tapered surface of the block provides a contact seal with the inner surface of the device. The device is installed in the oven. When molten metal is drained from the drain nozzle of the crucible 12, the melt 13, pouring over the walls of the device, fills the internal cavity of the block, passes through the drain channel and is fed into the furnace crystallizer. After finishing the melting, the device is removed from the furnace. It is being disassembled. The flat flange is removed, the detachable block is moved due to the tapering surface, then the segments are separated. When removing the buildup, the frozen metal formed by pouring into the internal cavity of the block is separated by breaking off. The resulting sample is sent for chemical analysis. The device can be used for subsequent meltings.

For subsequent melts, the device is reassembled.

Implementation of a utility model.

This device was tested when smelting a titanium alloy ingot in a vacuum arc skull furnace. After the casting process was completed, the device was disassembled and the sample was removed. The metal is completely poured into the internal cavity of the block; the sample has a dense structure throughout its entire volume without casting defects.

Thus, the proposed device makes it possible to shorten the technological cycle by eliminating the machining operation, reduce labor costs, and the detachable design of the block ensures its repeated use.

Claims (4)

1. A device for feeding the melt into the crystallizer of a skull furnace, containing side and end walls forming a channel tapering downward, characterized in that a through hole is made on the front end wall with a detachable block installed in it, formed by two cylindrical segments that form the internal cavity of the cylindrical forms. 2. The device according to claim 1, characterized in that the through hole on the front end wall is made with an outer taper mating with a chamfer, which is made at the end of the connector block. 3. The device according to claim 1, characterized in that the plane of the connector of the cylindrical segments forming the connector block is 120°. 4. The device according to claim 1, characterized in that the opposite end of the connector block is closed with a flat flange under the action of fasteners.