Neodymium-iron-boron magnet sintering furnace

Abstract

The invention discloses a neodymium-iron-boron magnet sintering furnace, and relates to the technical field of vacuum sintering furnaces. A smoke exhaust pipe, a furnace body, a furnace door and support legs are included, the top of the furnace body is fixedly connected with the smoke exhaust pipe, one end of the furnace body is fixedly provided with the furnace door, and the inner wall of the furnace body is fixedly connected with a heat insulation layer. A sintering cavity is fixedly connected to the side face, away from the furnace body, of the heat insulation layer, a servo motor is fixedly connected to the other end of the furnace body, a rotating shaft is welded to the driving end of the servo motor, and stirring rods are fixedly connected to the outer wall of the rotating shaft. Byadopting the combined arrangement of the stirring rods, limiting springs and stirring sleeves, when the servo motor drives the rotating shaft to rotate, the stirring sleeves can slide on the stirringrods through centrifugal force generated due to highly rotation of the rotating shaft so that the length of the stirring rods can be adjusted, and under the condition that the stirring sleeves do notrotate through the limiting springs, the total length between the stirring rod sleeves and the stirring rods is limited so that processed raw materials in the furnace body can be conveniently taken out.

Description

technical field [0001] The invention relates to the technical field of vacuum sintering furnaces, in particular to a sintering furnace for NdFeB magnets. Background technique [0002] NdFeB magnets can be divided into bonded NdFeB magnets and sintered NdFeB magnets. NdFeB magnets have the characteristics of small size, light weight and strong magnetism, and are the magnets with the best performance and price ratio so far. It is estimated that in the next 20-30 years, there will be no magnetic materials to replace NdFeB magnets. The main raw materials for the production of NdFeB magnets are metal neodymium, pure iron, boron-iron alloys and other additives, which are the core of the NdFeB magnet industry. Technology is mainly reflected in the manufacturing process, specifically in the uniformity, consistency, processing quality, and coating quality of its products. As the third-generation rare earth permanent magnet material, NdFeB magnets have a high performance-price ratio. ...

AI Technical Summary

Problems solved by technology

[0003] 1. At present, when NdFeB is processed in a sintering furnace, since the raw materials are generally piled up together, the inside of the raw materials cannot be fully reacted, resulting in incomplete NdFeB reaction. Stir the raw materials When the stirring rod is too long, it is inconvenient to take the material, and if the stirring rod is too short, it is easy to cause insufficient stirring of the NdFeB in the sintering furnace;

[0004] 2. During the process of stirring the raw materials in the sintering furnace, since the motor is in a state of continuous rotation, the collision between the stirring rod and the raw materials is likely to cause vibration, which will drive the inner wall of the sintering furnace to vibrate, which will easily affect the processing of the sintering furnace The stability of NdFeB, so structural innovation is required to solve specific problems

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