RU69074U1 - DEVICE FOR MODIFICATION OF ALLOYS IN CASTING FORM - Google Patents

Abstract

The utility model is aimed at creating a device for modifying alloys in a mold using electric current, which makes it possible to obtain alloys with enhanced mechanical properties. The specified technical result is achieved by the fact that in the device for modifying alloys in a mold by electric current, including a mold, an alternator, conductive elements are connected to the mold cavity, which are connected in series with the alternator through a voltage regulator, rectifier, switch.

Description

The utility model relates to the field of metallurgy, namely, to devices for modifying alloys.

A device for modifying non-ferrous metal alloys [1] is known, consisting of a container into which the alloy is poured, an inductor and a mold (mold). The disadvantage of this device is that before crystallization during processing by a magnetic field and modification, mixing of the molten alloy occurs, which leads to contamination of the alloy with sludge, to a decrease in the quality of the ingot and its mechanical properties.

A device for modifying and casting non-ferrous metal alloys [2], containing a container for an alloy, a pump with a metal path, a magnetic field source in the form of an alternating magnetic field inductor located on the metal path of the pump outside the tank, molds. The disadvantage of this device is the complexity of the equipment used, the weak modification effect and the low mechanical properties of the resulting alloys.

Closest [3] to the proposed utility model is a device for modifying processing and casting of non-ferrous metal alloys, containing an alternating current generator and a casting mold in the form of a conductive mold. The disadvantage of this device is the complexity of the equipment used, the weak effect of modification due to the impossibility of directing a direct electric current and the low mechanical properties of the resulting alloys.

The objective of the proposed utility model is to create a device for modifying alloys in a mold by electric current, which allows to obtain alloys with enhanced mechanical properties.

To solve the problem in a device for modifying alloys in a mold by electric current, including a mold, an alternator, conductive elements are connected to the mold cavity, which are connected in series with the alternator through a voltage regulator, rectifier, switch.

The figure shows the claimed device.

The device contains a series-connected alternator 1, a voltage regulator 2, a rectifier 3 and a switch 4, to the output of which conductive elements 5 are placed in the cavity 6 of the mold 7.

The device operates as follows. The melt is poured into the cavity 6 of the mold 7. During the crystallization, the melt undergoes a modifying treatment with electric current, which is carried out using an alternating current generator 1, connected with the conductive elements 5 to the cavity 6 of the mold 7 through a series connection with the voltage regulator 2, rectifier 3 , switch 4. The current strength can be varied in the range of 30 ... 50 A (with a current density of j = (0.43 ÷ 0.72) · 10 ⁵ A / m ² ). The current using switch 4 can be induced both alternating and constant. This device does not provide restrictions on the size and configuration of the cavity for pouring the melt and the mold.

This device allows you to provide a stronger modifying effect due to the possibility of processing the melt with alternating or direct electric current, which contributes to obtaining a fine-grained alloy structure and a high level of mechanical properties.

Example: We studied the effect of electric current induced by the proposed device on the mechanical properties of AK7ch industrial aluminum alloy. Smelting was carried out in a resistance furnace. The samples were poured to study the mechanical properties

in the sandy-clay form, where the conductors from the device were placed.

The mechanical properties of the AK7ch alloy subjected to direct electric current in the mold using the proposed device are shown in the table. The table also shows the mechanical properties of the alloy AK7ch treated with alternating electric current using a known device [3]. The results shown in the table show that the modification of direct alloy electric current AK7ch alloy using the proposed device gives a higher level of mechanical properties than using the known device [3].

Table
The influence of the method of modification by electric current on the mechanical properties of the AK7ch alloy The method of modification of the magnetic field The nature of the induced electric current Mechanical properties σ _B , MPa δ,% Famous [3] Variable 171 ... 195 2.6 ... 3.7 Proposed Constant 197 ... 220 3.9 ... 4.8

INFORMATION SOURCES

1. Chukhrov M.V. Modification of magnesium alloys. - M.: Metallurgy, 1972, S.148-169.

2. Patent RU 2230823 C2 7 C22F 3/00, B22D 21/00.

3. Zarembo V.I., Kiseleva O. L., Kolesnikov A. A. et al. Influence of current pulses on the processes of melting and crystallization of metals / Metallurgy Engineering. 2005. No1. S.11-15.

Claims (1)

A device for modifying alloys in a mold by electric current, including a mold, an alternator, characterized in that conductive elements are connected to the mold cavity, which are connected in series with the alternator through a voltage regulator, rectifier, switch.