Energy-saving sintering device for neodymium-iron-boron magnet

Abstract

The invention discloses an energy-saving sintering device for a neodymium-iron-boron magnet. The energy-saving type sintering device comprises an outer silo, wherein four sets of supporting columns are evenly installed at the bottom of the outer side of the outer silo; an inner silo is arranged at the inner side of the outer silo; a cavity is formed between the inner silo and the outer silo; a spiral guide plate is arranged in the cavity; and an induction coil is installed on the inner wall of the inner silo. When the air pressure in the inner silo is recovered, a third electromagnetic valve and a first electromagnetic valve are opened, gas in a gas storage tank enters the cavity, then the gas in the cavity flows along the guide of the spiral guide plate, the gas flowing through the surface of the inner silo can be heated by the outer side of the inner silo with the higher temperature, the high-temperature gas passes through the cavity and then flows into the inner silo through the first electromagnetic valve, so that the air pressure in the inner silo is gradually recovered, and due to the fact that the temperature of the gas entering the inner silo is high, the neodymium-iron-boron magnet does not crack due to large temperature difference.

Description

technical field [0001] The invention relates to the technical field of sintering furnace equipment, in particular to an energy-saving sintering device for NdFeB magnets. Background technique [0002] Neodymium iron boron permanent magnet material is a high-performance permanent magnet material that came out in 1983. It is the third generation of rare earth permanent magnets, and it is one of several permanent magnets with strong magnetic properties today. Due to the addition of non-magnetic bonding agents and additives in the raw materials of junction-type NdFeB materials, the magnetic energy of the finished magnet is lower than that of the sintered type, but it has good plasticity. Due to the addition of bonding agents, it can be designed in different shapes Magnets with different shapes and thicknesses are suitable for industries and occasions with special requirements. [0003] When the current NdFeB magnet sintering device is cooling down, it often directly injects cool...

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Problems solved by technology

[0003] When the current NdFeB magnet sintering device is cooling down, it often directly injects cooling water from bottom to top into the cooling layer in the sintering chamber to cool down, and the cooling liquid after cooling is difficult to quickly cool down and re-enter the circulation for use. The cooling of the device next time reduces the use effect of the entire sintering device; and the NdFeB magnets that can be placed in the current NdFeB magnet sintering device are very limited, and after the NdFeB magnet sintering is completed, the operator also It is not convenient to take out all the NdFeB magnets inside the device or place a new set of NdFeB magnets, and the position of the NdFeB magnets placed inside the traditional sintering device is often unchanged, so that it is impossible to effectively improve the sintering device's internal NdFeB magnets. The sintering effect of iron-boron magnets; at the same time, when the current NdFeB magnet sintering device restores the chamber door pressure before cooling down, if the outside room temperature air is directly input into the sintering chamber, the relatively low room temperature air and the hot neodymium iron After the boron magnet products are in direct contact, due to the large temperature difference, the NdFeB magnet products will crack, which will greatly reduce the qualified rate of the products manufactured by the device

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