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KR-20260062106-A - Sm-Fe-N bond magnet manufacturing raw material mixing device

KR20260062106AKR 20260062106 AKR20260062106 AKR 20260062106AKR-20260062106-A

Abstract

The present invention relates to a raw material mixing device for manufacturing Sm-Fe-N bonded magnets, and more specifically, to a raw material mixing device for manufacturing Sm-Fe-N bonded magnets capable of mixing magnet powder and binder resin while maintaining a set mixing efficiency by mixing magnet powder and binder resin continuously and simultaneously mixing and collecting dust inside a mixing body used for mixing during the process of manufacturing Sm-Fe-N bonded magnets. To this end, the present invention comprises a device for mixing powders for manufacturing Sm-Fe-N bonded magnets, comprising: a mixing body having a mixing space provided inside, which mixes magnet powder and binder resin introduced through an inlet and discharges them through an outlet; a moving module that moves the mixing body along a designated path; and a mixing unit disposed on the path provided by the moving module and detachably coupled to the mixing body, which rotates the mixing body to mix the introduced magnet powder and binder resin. It is characterized by including a dust collection unit that is positioned in a path provided by the above-mentioned moving module and collects dust inside a mixing body from which a mixture is discharged.

Inventors

  • 이경재
  • 김창수
  • 강병현

Assignees

  • 주식회사 에스아이티

Dates

Publication Date
20260507
Application Date
20241024

Claims (5)

  1. As a device for mixing powder for manufacturing Sm-Fe-N bonded magnets, A mixing body (10) having a mixing space (13) provided inside, which mixes magnet powder and binder resin introduced through an inlet (11) and discharges through an outlet (12); A movement module (20) for moving the above-mentioned mixing body (10) along a designated path; A mixing unit (30) that is positioned in a path provided by the above-mentioned moving module (20) and is detachably coupled to the above-mentioned mixing body (10), and mixes the introduced magnet powder and binder resin by rotating the mixing body (10); A raw material mixing device for manufacturing Sm-Fe-N bonded magnets, characterized by including a dust collection unit (40) that is positioned in a path provided by the above-mentioned moving module (20) and collects dust inside a mixing body (10) from which a mixture is discharged.
  2. In claim 1, the mixing part (30) is, A mixing motor (31) operated by an authorized power source and signal, and A coupler (32) to which the motor shaft (311) of the mixing motor (31) is coupled and the stirring shaft (14) provided in the mixing body (10) is detachably coupled, and A raw material mixing device for manufacturing Sm-Fe-N bonded magnets, characterized by including a lifting means (33) for moving the above mixing motor (31) in a vertical direction.
  3. In claim 2, the lifting means (33) is, A lifting plate (331) on which the above mixing motor (31) is installed, and One or more lifting rods (332) that are joined to the bottom surface of the lifting plate (331), and A lifting drive (333) that operates the lifting rod (332) to raise or lower it, and A raw material mixing device for manufacturing Sm-Fe-N bonded magnets, characterized by including a position alignment sensor (334) provided on the lifting plate (331) to detect the position of the coupler (32) and the mixing body (10).
  4. In claim 1 or 2, the dust collection unit (40) is, A dust collection tube (41) made of a flexible tubular body that can adjust length and angle, with one end in the longitudinal direction detachably connected to one side of the mixing body (10), and A dust collector (42) that operates by an authorized power source and signal, and in which the longitudinal end of the dust collection tube (41) is coupled to provide suction force, and A connecting tube (43) that is detachably connected to one end in the longitudinal direction of the above dust collection tube (41), and A central rod (44) that extends in the longitudinal direction, with one end in the longitudinal direction connected to the connecting tube (43), and A raw material mixing device for manufacturing Sm-Fe-N bonded magnets, characterized by including a plurality of brushes (45) installed at mutually spaced intervals along the outer circumference of the central rod (44), with each brush having one end in the longitudinal direction rotatably installed on the central rod (44).
  5. In claim 4, the connecting tube (43) is, A center plate (431) to which one end of the above central rod (44) is detachably connected, and An out ring (432) positioned at a location spaced outward from the outer circumference of the center plate (431), and A plurality of connecting ribs (433) connecting the center plate (431) and the outer ring (432), and A raw material mixing device for manufacturing Sm-Fe-N bonded magnets, characterized by including a moving hole (434) formed between adjacent connecting ribs (433) to move dust collected in the mixing body (10) to the dust collection pipe (41).

Description

Sm-Fe-N bond magnet manufacturing raw material mixing device The present invention relates to a raw material mixing device for manufacturing Sm-Fe-N bonded magnets, and more specifically, to a raw material mixing device for manufacturing Sm-Fe-N bonded magnets that mixes magnet powder and binder resin during a process of manufacturing Sm-Fe-N bonded magnets, wherein the magnet powder and binder resin are mixed continuously, and dust is collected after mixing inside a mixing body used for mixing, thereby allowing the magnet powder and binder resin to be mixed while maintaining a set mixing efficiency. Currently, Nd-Fe-B (neodymium-iron-boron) magnets are primarily used as permanent magnets for applications requiring high magnetic force (maximum energy product); however, Sm-Fe-N (samarium-iron-nitrogen) magnets containing Sm, Fe, and N are known as magnets with properties that surpass those of Nd-Fe-B magnets. Here, some of the Fe can be replaced with Co (cobalt). The above Sm-Fe-N magnet has the characteristics of saturation magnetic polarization similar to that of Nd-Fe-B magnets, an anisotropic magnetic field and Curie temperature higher than that of Nd-Fe-B magnets, and resistance to oxidation and rust formation. Generally, powders used as raw materials for sintered magnets or bonded magnets are classified into isotropic magnetic powders and anisotropic magnetic powders according to their magnetism. Here, isotropic magnetic powder refers to powder in which individual powder particles are formed from a plurality of fine crystal grains and the easy magnetization direction of each crystal grain is random, and anisotropic magnetic powder refers to powder in which individual powder particles are single crystals, or in which, even when individual powder particles are formed from a plurality of fine crystal grains, the easy magnetization direction of each crystal grain is aligned in a specific direction. The crystals constituting the Sm-Fe-N magnet decompose at temperatures exceeding approximately 500°C. Therefore, the Sm-Fe-N magnet cannot be a sintered magnet, which requires raising the temperature to around 1000°C during manufacturing, and is used as a bonded magnet. Generally, bonded magnets are manufactured by mixing magnet powder and a binder, and then molding the mixture using a compression molding machine, injection molding machine, etc. Therefore, although bonded magnets have a magnetic flux density inferior to that of sintered magnets by an amount corresponding to the presence of binders or voids, they have the characteristic of being easy to obtain bonded magnets with small, thin, or complex shapes. Meanwhile, Sm-Fe-N magnet powder can be manufactured using a liquid quenching method. Sm-Fe powder is produced by heating and melting the raw materials for Sm-Fe powder, then rapidly cooling the resulting molten alloy by spraying it onto a rotary cooler from a spray nozzle. The manufactured Sm-Fe powder is then nitrided to obtain Sm-Fe-N isotropic magnet powder. Here, as the grain size of the Sm-Fe-N isotropic magnet powder becomes smaller, faster cooling is required because a higher maximum energy product (BH)max is obtained due to the effect of exchange interaction. Meanwhile, the mixing of Sm-Fe-N magnet powder and binder is mostly done using a general powder mixer, which feeds the magnet powder and binder according to the mixing ratio, stirs for a predetermined period of time, and then discharges the mixture. In such conventional powder mixers, the amount that can be mixed is determined by the capacity of the mixing tank constituting the mixer. Therefore, to increase the mixing amount, the size of the mixing tank must be increased; however, as the size of the mixing tank increases, the components such as the stirring blades placed inside also become larger, and the capacity of the driving means for rotating them also increases. Furthermore, even if the size of the mixing tank is increased, continuous mixing cannot be achieved because the process cycle of input, mixing, and discharge of the magnet powder and binder to be mixed takes place in a single powder mixer. This has caused an increase in the time required for the mixing of Sm-Fe-N magnet powder and binder, and for the manufacturing process of Sm-Fe-N bonded magnets using this mixture. In addition, Sm-Fe-N magnet powder and binder powder that were not discharged, as well as impurities, remained inside the mixing tank where mixing took place, and there was a problem in that the remaining powders sometimes affected the next process. FIG. 1 is an exemplary schematic diagram illustrating a raw material mixing apparatus for manufacturing Sm-Fe-N bonded magnets according to the present invention. FIG. 2 is an exemplary diagram illustrating a mixing body and a mixing section constituting the present invention. FIG. 3 is a diagram illustrating the operating state of the mixing unit constituting the present invention. FIG. 4 is an exemplary diagram illustr