SU1102655A1 - Method of manufacturing article from ferromagnetic material and device for effecting same - Google Patents

Abstract

1. A method of manufacturing a product from a ferromagnetic material, including the supply of a dispersed ferromagnetic material with a binder into a mold, hardening the material in it and subsequent continuous material hardening, characterized in that, in order to increase productivity and reduce the wear of the shaper, hardening is performed with continuous pulling the material by exposing it to an external constant-time magnetic field directed along the axis of the product.

Description

2. An apparatus for manufacturing a product from ferromagnetic material, comprising a shaper, a magnetic field source and a gripping mechanism for stretching the product, characterized in that, in order to increase productivity and reduce shaper wear, the magnetic field source is made 6 in the form of one or more

electromagnetic coils located coaxially to a form-taking device and to a grip, the electromagnetic coils around the perimeter are covered with a ferromagnetic casing adjacent its face to the shaper, and the inner surface of the grip is made conical with a tilt angle of 5-40.

The invention relates to powder metallurgy and foundry, in particular, to methods and devices for the formation of iz, constant cross sections, containing in their composition dispersed ferromagnetic materials.

A known method of forming articles of constant cross section from melts, in which liquid molten material is fed into a water-cooled former (mold), partially strengthened in a former. when hardening, moving the partially hardened material and the resulting product by pulling it, mixing the uncured material in the product with a rotating non-uniform alternating transverse magnetic field, the induction vector of which is predominantly in a plane perpendicular to the axis of the product CO The method is unsuitable for forming products containing dispersed ferromagnetic materials , due to the lack of compaction in the former.

A device for implementing this method is known, comprising a shaper in the form of a cylindrical water-cooled mold mounted on a trolley and having the possibility of moving a horizontal plane, the source of a magnetic field (induction rotator) in the form of an asynchronous motor stator to create a transverse inhomogeneous magnetic

field, rotating in the plane, perpendicular to the axis of the product, the induction vector of which is located in the plane, perpendicular to the axis

product located under the shaper coaxially with it, water-cooled brass cylinder placed inside the rotator and designed to protect the winding

from overheating, a mechanism for pulling the product out of the shaper with a device for initially drawing (gripping), there are internal inclined surfaces, product coolers after the former, placed under the rotator, a mechanism for cutting the product into measured lengths t23.

However, this device is unsuitable for shaping products containing dispersed ferromagnetic materials, due to the lack of necessary devices for compacting the material in the former with external forces and moving the material relative to the former. The movement does not occur because the initial stretching device does not provide a strong bond with the dispersed unconsolidated material.

The closest to the invention in its technical essence and the achieved result is the manufacture of a product from a ferromagnetic material, including the supply of a dispersed ferromagnetic material with a binder to the former, hardening of the material in it and the subsequent continuous extrusion of the NF material. The disadvantages of the known method are increased wear of the shaper (punch and die with die), reduced productivity because the working stroke of the punch alternates with idle, an increased binder consumption, which is added not only to give strength to the product, but to reduce friction between particles, the need applying high pressures for extrusion. The closest to the invention of the technical essence and the achieved result is a device for the manufacture of a product from ferromagnetic material, containing a shaper, a source of a magnetic field and a mechanism for stretching the product with a C grab. 3. The disadvantages of the known device when forming from ferromagnetic dispersed materials are are: inefficient compaction and hardening of the material by magnetic forces in the former, as the strongest field acts on the walls in the upper part of the former (Closer to the pole tips), and in its middle it is practically absent (the field is not created in the lower part of the mold former); the absence of the floor and, therefore, the strengthening of the material of the lower part of the shaper does not allow the product to be pulled out of the shaper. The lack of a prismatic device (grip) is closed in that the transverse dimensions of its narrow part are much smaller than the transverse dimensions of the product. This leads either to the destruction of the product and in case of its magnetization, or to an excessive increase in the height of the capture cone, and the angle between the nakloin surfaces is very large (about 120 °). The purpose of the invention is to increase the productivity and reduce shaper wear. This goal is achieved by the fact that according to the method of manufacturing a product from a ferromagnetic material, which includes feeding dispersed ferromagnetic material with a binder into the former, hardening the material in it and the subsequent continuous extrusion of the material hardening is performed with continuous; pulling the material by applying an external constant in time magnetic field directed along the axis of the product. In addition, in a device for manufacturing a product from a ferromagnetic material containing a shaper, a source of magnetic field and a mechanism with grippers for pulling the product, the source of the magnetic field is made up of one or more electromagnetic coils arranged coaxially to the shaper and the gripper, with electromagnetic coils around the perimeter they are covered with a ferromagnetic casing adjoining its former surface to the former, and the internal gripping surface is made conical with an angle of inclination 5-40 °. The drawing shows a diagram of the device. An apparatus for manufacturing an article comprises a non-ferromagnetic shaper 1., made with an internal cylindrical surface and an angle between inclined surfaces 90, a source of magnetic field, which includes an electric coil 2 covering the lower part of the shaper, and an electric coil 3 surrounding the product 4 (or part of it) , the extrusion mechanism of the product from the shaper t (not shown) with the grip 5 having inclined (conical) at an angle of 40 ° to the inner surface of the product. Coils 2 and 3 around the perimeter are covered with a ferromagnetic housing 6, which adjoins shaper 1 from the end. The number of electric coils 2 and 3 of the source of the magnetic field is determined from the convenience of their installation and disassembly, maintenance, cooling and other design and operational considerations and little effect on technological parameters. The use of a new method of forming products using the proposed device provides an increase in the productivity of forming a mold

511.02655

3-5 times, reduced wear on the shape-and-product and reduced binder consumption, reduced effort, optional.

shaping, expected economic effect

higher compaction uniformity will be 30,800 rubles.

Claims (1)

1. A method of manufacturing a product from a ferromagnetic material, comprising supplying a dispersed ferromagnetic material with a binder to the former, forming material in it and then continuously extruding the material, characterized in that, in order to increase productivity and reduce wear of the former, the strengthening is carried out with continuous pulling the material by exposing it to an external time constant magnetic field directed along the axis of the product.