SU1519836A1 - Mould - Google Patents

Abstract

The invention relates to foundry, namely casting into shell molds in crossed electromagnetic fields. The purpose of the invention is to improve the quality of castings. The proposed mold is provided with two through-holes made of heat-resistant non-conducting material with partitions 6 with a bridge between them, with the partitions 6 installed in the profitable cavity 2 parallel to the plane of the axes of the vypors, removed from each other by a distance not exceeding the perpendicular size of the feeder and with a gap of 8 with respect to the bottom 3 of the profitable cavity 2. The implementation of the invention further reduces power consumption in the production of castings. 2 Il.

Description

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from 00 to a

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The invention relates to foundry, in particular, to casting on melted models in crossed electric and magnetic fields.

The purpose of the invention is to improve the quality of castings.

FIG. 1 shows the proposed device; in fig. 2 - the same cross section.

The mold contains a gating system with a feeder 1 having a profitable cavity 2 with a bottom 3 and at least two notches 4 on top for insertion of the electrodes; provided with two, having through holes 5, made of heat-resistant non-conductor of the first material, such as electrocorundum, partitions 6 with a bridge 7 between them, and partitions 6 are installed in the profitable cavity 2 parallel to the plane of the axes of the axes 4, spaced apart from each other the size of the feeder 1 that is not perpendicular to them, and with a gap of 8, according to OTHonie, to the DIIP1U 2 profitable cavity 2.

The device works as follows.

After pouring the melt into the mold and filling all cavities with it, turn on the magnetic field and pass an electric current through the melt between the baffles 6, which reduce the cross section of the pipe. In cavity 1, electromagnetic forces are excited in the melt. The magnitude of the magnetic field and the current strength are similar in the known device. The magnitude of the electromagnetic field forces is determined by the generation of current density and magnetic zero induction. Since the density of the electric current is inversely proportional to the cross section through which it passes, in the melt between the partitions () the electromagnetic volume forces increase. The mutual orientation of the magnetic and electric fields is chosen in such a way that the action of the forces is directed vertically downwards, i.e. 1) asplav is pumped through the feeder 1 into the cavity 9 for shaping the casting. The use of jumper 7 makes it possible to additionally increase the pressure on the liquid metal due to the narrowing of the transverse conductive section of the liquid metal, while the amount of liquid metal required for the submersion of the casting and due to the size of the profitable cavity 2 remains unchanged. Height

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19836

four

the partitions 6 are equal to the height of the profitable cavity 2, taking into account the fact that between the three channels in the profitable cavity 2 formed by the partitions 6, the communication of the liquid metal should be carried out

 the gap between the bottom 3 of the profitable part of the cavity 2 and the partitions 6. In addition, the central channel of the profitable cavity 2 is fed through the through holes 5 of the partitions 6.

10 The effectiveness of the application of the proposed casting mold was revealed in the course of experimental work on the USEMP-1 installation, carried out at one of the sub-branch plants.

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15 In this case, the formula P was used which is derived from the hydrostatic equation, where P is the pressure of the electromagnetic volume forces between the barriers. Pa; I is the current flowing

20 through the melt between the partitions. BUT; In -kg

magnetic field induction

v - u and

25

thirty

45

35

40

50

Rina channel, m

In our case, the width of the middle channel (the distance between the partitions) is half the width of the profit and the use of partitions increases the pressure on the melt in the feeder by two times. A similar increase in pressure could be obtained without the use of partitions, by doubling the strength of current 1.

The implementation of the invention makes it possible to further grind the structure of the casting melt and reduce the specific energy consumption.

Claims (1)

Invention Formula A casting mold containing a gating system with a profit, a feeder and two vypori placed on the profit, characterized in that, in order to improve the quality of the castings, it is equipped with a throttling element in the form of two parallel plates of electrocorped connected by a jumper perpendicular to them placed in profit with a gap to its bottom parallel to the plane of the axes of the vypors, the plates are made with holes, the jumper is mounted coaxially with the feeder, and the distance between the outer planes of the said Astin does not exceed the cross size of the inlet feeder.