Installation for the production of permanent magnets from alloys of rare earth metals

 

(57) Abstract:

The inventive system includes sequentially installed devices obtain alloy, pre-and fine grinding his, sealing the resulting powder in an electromagnetic field, sintering heat treatment, machining and namagnichivaniya. Device for sealing powder is made in the form of vibro-impact device with vertical press-form, in which is mounted a piston, and a device for fine grinding is made in the form of shock-centrifugal mill-separator, the discharge device through which the cyclone is connected with the mold installed in a sealed chamber. 2 Il.

The invention relates to equipment for the production of permanent magnets on the basis of metal alloys that can be used in instrumentation, automation, computer engineering, electrical and radio and other industries.

Known installation for the production of permanent magnets from alloys of rare earth metals containing sequentially installed devices obtain alloy, pre-and fine grinding his, compaction of the powder in the electromagnet is 01 F 1/08, 1985).

In Fig. 1 shows a diagram of the installation of Fig.2 fine grinding device and a device for compacting powder.

The installation consists of sequentially installed devices for producing an alloy of rare earth metals. The device 1 is connected with a device for the pre 2 and 3 thin grinding. The latter is in the form of shock-centrifugal mill separator. The mill through the cyclone 4 is connected with vibro device 5 to seal the powder with a vertical press-form 6, outside of which there is an electromagnetic system 7. Vibro device 5 contains the vibrator 8, which consists of a magnetostrictive transducer, connected to the acoustic emitter, coaxially with it rod bushings, frame, springs and firing pin (not shown). Source of energy of ultrasonic frequency is ultrasonic generator, which has a remote control 9. In addition, the installation includes a device for sintering and heat treatment 11, machining 12 and the magnetization 13. Electromagnetic coil system 7 is controlled from the remote control 10. Mill separator is a located inside the rotor, mounted on a horizontal shaft, the mold 6 is the piston. The cyclone hopper and press-form 6 vibrator 5 is placed in a sealed chamber 14 with an inert gas.

The device operates as follows.

After preparation of the mixture in the device 1 receives the base alloy of rare earth metals, which is then crushed in the device 2 of the preliminary grinding, usually in a jaw crusher to a particle size of 1-5 mm, the material Then enters the shock-centrifugal mill separator 3, in which the inert gas is ground to a particle size less than 10 microns. While the crushed particles, transformiruyuscheesya through the ventilation effect of the mill, in contact with the rotating rotor of the mill opposite God so loved, ukatyvayutsya and get the shape close to spherical. Crushed to a specified process regulations size particles into the cyclone 4 and neosmechennye particles go back to grinding. From the cyclone hopper 4 particles are transported in a vertical press-form 6-shocking device 5. Then include an ultrasonic generator, a magnetostrictive transducer transforms the vibrations into mechanical transmitted acoustic emitter, and ultimately possible conglomerates of particles, to increase freedom of relative movement and the orientation of the spherical particles of a given size. This creates optimal conditions the orientation of the domains under the action of electromagnetic system 7 along the axis of the coil. I.e., the conditions of achieving anisotropic billet uniform density over the entire height of long products.

After vibration compaction mold 6 is sealed and transmitted to the device 11, in which transactions sintering and heat treatment of the mold 4 is removed workpiece. When this mold 6 is returned to the device 5 for re-filling with powder, and the workpiece is fed to the operation of machining and magnetization.

Installation for the production of permanent magnets from alloys has the following technical and economic advantages compared to the prototype.

Improving the quality of long products by 25-30% due to the homogeneous density and magnetization properties in height, and also due to the exclusion of oxidation of the particles.

Increased efficiency due to the replacement of expensive bulky metal device for pressing on a budget detelnosti installation by reducing operations (excluded the operation of the transportation device with fine grinding in vibro-impact device, no device for drying powder after grinding and counting the number of defective items).

INSTALLATION FOR the PRODUCTION of PERMANENT MAGNETS FROM ALLOYS of RARE earth METALS, mainly lengthy, containing sequentially installed devices obtain alloy, pre-and fine grinding his, compaction of the powder in the electromagnetic field, sintering heat treatment, machining and magnetization, characterized in that it is equipped with a sealed chamber, a device for fine grinding is made in the form of shock-centrifugal mill-separator with discharge node, and the sealing device of the powder in the electromagnetic field in the form of vibro-impact device with vertical press-form and mounted inside the piston, moreover, the discharge node mill-separator is connected with the mold through the cyclone, and the mold is mounted in a sealed chamber.

 

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