SU116420A1 - The method of filling out the forms and apparatus for implementing the method - Google Patents

Description

In the known methods of casting under pressure and other special types of pouring, the forced filling of a mold with a liquid metal is achieved by applying pressure to the metal by means of compressed gas or a piston.

The disadvantage of these techniques is the presence in the casting unit of moving parts in contact with the liquid metal, and the pouring of the liquid metal with gases and cooling it in the compression chamber or on the way to the mold.

According to the invention, the mold is filled by pumping a liquid metal into it by electromagnetic forces generated inside a liquid metal by the action of a moving electromagnetic field. The possibility is used of changing the direction of action of electromagnetic forces by changing the direction of field movement and heating the liquid metal by induction currents induced in it by electromagnetic field.

FIG. Figure 1 shows one of the layout options for a casting unit for carrying out the proposed method; in fig. 2-12 are variants of a constructive solution of an induction supercharger of a node in which an impact on a liquid metal is driven by an electromagnetic magnet.

FIG. 1 shows an induction supercharger in which an inductor of a progressively moving, i.e. running, magnetic field is used in the form of two deployed stators of an asynchronous electric motor consisting of a welded magnetic conductor 1 laid in the slots of the last refractory 2 and located inside the inductor of the refractory pipe 5, which on the one hand communicates with the furnace or reservoir for the liquid metal 4, and on the other hand connects with the cavity of the mold 5.

The running electromagnetic field of the inductor penetrates the walls of the refractory tube 5 and the liquid metal in the channel. In the last # 116420-- 2

Induction currents are generated in it, which, interacting with the inductor's field, create electromagnetic forces in the liquid metal that are directed in the same direction as the field moves.

To force form 5 to fill with liquid metal, the traveling electromagnetic field moves in the direction of the form and the electromagnetic forces created by it cause the injection of metal into it. Before opening the form or disconnecting from the tube 3 of the interchangeable shape, the traveling electromagnetic field is moved in the opposite direction, and it is compensated by the electromagnetic forces by the hydrostatic pressure of the metal in the furnace or tank 4 acting as a stopper preventing the metal from flowing out through the open channel of the pipe.

The heat of induction currents is used to prevent metal from freezing in the pipe channel.

FIG. Figures 2 and 3 show in two projections an induction blower, in which, unlike the above, an inductor of a rotating magnetic field is used, consisting of a circular magnetic circuit 1 and a three-phase winding 2. A rotating magnetic field informs the liquid metal in translational motion due to the fact that channel K. in which there is a metal, has the form of a spiral spiral of FIGS. 4 and 5 shows an axial section and a section along the LL device, in which the channel / C has the form of a flat spiral, and the inductor of a rotating magnetic field with a magnetic core / and o The winding 2 is designed as a stator of a disk asynchronous electric machine with a three-phase winding, however, it can also be made in the form of a rotating rotor with a winding excited by a direct current.

Pia FIG. Figures 6 and 7 depict an axial sectional top view of a similar device with a channel in the form of a helical spiral / C located between the ring magnetic circuit / and the inductor of a rotating magnetic field, 3 of which the winding 2, driven by a direct current, is a rotating rotor.

FIG. 8 depicts the axial and qbKr. 9 are transverse sections of the induction supercharger with the running magnetic field of the inductor, with a radial bushing of the magnetic circuit / c winding 2 in the form of ring turns covering the cylindrical refractory pipe 3 and located in a plane perpendicular to the axis of the channel K of the pipe. To prevent the vortex motion of the liquid metal in the channel and its reverse flow in the axial part, where the electromagnetic forces are weakened, the axial part of the drop K. is filled with core 6.

In order to improve the electrical performance of the induction supercharger, the core 6 can simultaneously enclose the magnetic core, but which closes the magnetic flux of the inductor, as shown in FIG. 10, where a cross section is given to a supercharger for metals with mp pl- below the Curie point.

In the grooves of the external magnetic core 1 there are arranged annular or spiral turns of the winding 2, covering the pipe 3 of non-magnetic heat-resistant steel, insulated from the inductor by a thermal insulation layer 7. The core consists of a heat-resistant non-magnetic pipe 8, inside which there is a wire magnetic core 9.

Large sizes of the cross section of the core, as shown in FIG. 11 and 12, its magnetic pipeline may have a winding 10 in the form of ring turns of spirals coaxial with a winding 2 located in the grooves of the external magnetic core /. The external and internal inductors are protected from the liquid metal by two coaxial refractory tubes 3.

As a channel in which the liquid metal is exposed to a traveling electromagnetic field, in one of the embodiments of the device for carrying out the proposed method, it is contemplated to use and through the cavity of the smelting furnace or reservoir for the liquid metal.

Claims (7)

1. A method of filling forms with forced injection of a letale using a magnetic field, characterized in that, in order to create a liquid metal head by electromagnetic forces interacting a magnetic field and currents induced in the metal, the metal is fed from the smelting unit or tank to a form that penetrates through the mold moving magnetic field, so that the direction of the channel axis coincides with the direction of the linear velocity vector of the field or component of this vector, with the simultaneous use of currents induced in idkom metal, for its heating. 2. Acceptance of the method according to claim 1, about t and h with the fact that, in order to stop the metal in order to avoid its expiration from the channel when changing forms and returning part of the metal to the tank, create an electromagnetic field moving in the direction reverse the original. 3. Device for implementing the method according to claims. 1 and 2, distinguished by the fact that it uses an inductor of a traveling electromagnetic field, which informs the translational motion of the liquid metal in the channel. 4. Device for carrying out the method according to claims. 1 and 2, characterized in that an inductor of a rotating magnetic field is applied, and the channel is made in the form of a spiral or a part of it in order to inform the metal in the channel translational movement instead of the rotational one. 5. The form of the device according to claim 3, characterized by the use of two deployed asynchronous stators, creating a running field between them, where the metal passes through the channel, and one of the stators can be replaced by a non-winding magnetic conductor. 6- The form of the device according to claim 3, characterized by using a winding li in the form of coils covering the channel and drawing up a magnetic conductor (if present) from iron sheets, parallel to smallpox channel, or wire, or massive magnetic conductive segments. 7. The form of the device according to paragraphs. 3-6, characterized in that, in order to increase the generated pressure of the liquid metal or to improve the power factor of the inductor, a core made of a refractory dielectric plp of a lined magnetic core is placed in the central part of the channel. - 3 -, Ni 116420 Subject invention five; H v FIG. ten