Pressing die for bonded neodymium-iron-boron magnetic body

Abstract

The invention discloses a pressing die for a bonded neodymium-iron-boron magnetic body. The pressing die comprises an upper punching die, a middle die, a lower punching die and a core rod. A tubular upper punching die punch and a tubular lower punching die punch are bonded to the front end of the hollow upper punching die with a T-shaped cross section and the front end of the hollow lower punching die with a T-shaped cross section respectively. A matching rod is bonded to the front end of the core rod. A middle die core is arranged at the wall of a center hole of the middle die through an embedded opening in an interference fit mode. The matching rod is inserted into the middle die core and located at the axis of the middle die core. The matching rod is sleeved with the upper punching die punch and the lower punching die punch in a spaced mode. The upper punching die punch and the lower punching die punch are both in clearance fit with the inner wall of the middle die core. The pressing die is simple in structure and convenient to operate, is used for molding the bonded neodymium-iron-boron magnetic body and can bear pressure of more than 400 t; since release agents are not needed, it can be guaranteed that holding-on caused by heating expansion in the pressing process will not happen, powder leakage and powder blockage are avoided, the service life is long, and the productivity is high.

Description

technical field [0001] The invention belongs to the field of pressing dies for powder molding, and in particular relates to a pressing die for bonded NdFeB magnets. Background technique [0002] With the continuous expansion of the application of NdFeB magnetic materials in the industrial field, some magnets with high requirements on magnetic properties and large sizes need to be produced by compression molding. The bonded NdFeB magnetic powder has high hardness and is easy to corrode. In pursuit of higher magnetic properties, the mold should withstand greater pressing pressure and mold release force, and it is not suitable to use a mold release agent during the pressing process. These urgently need a pressing mold for NdFeB magnetic powder for bonding molding. The mold needs Long service life, good economy, meet the pressing pressure of more than 400t. Contents of the invention [0003] The present invention is proposed to solve the problems in the prior art, and its pur...

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Problems solved by technology

[0002] With the continuous expansion of the application of NdFeB magnetic materials in the industrial field, some magnets with high requirements on magnetic properties and large sizes need to be produced by compression molding. The bonded NdFeB magnetic powder has high hardness and is easy to corrode. In pursuit of higher magnetic properties, the mold should withstand greater pressing pressure and mold release force, and it is not suitable to use a mold release agent during the pressing process. These urgently need a pressing mold for NdFeB magnetic powder for bonding molding. The mold needs Long service life, good economy, meet the pressing force of more than 400t

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