Crushing method and device for HDDR anisotropic neodymium iron boron magnetic powder for mold pressing bonding

The invention provides a method and device for crushing HDDR anisotropic neodymium iron boron magnetic powder for mold pressing bonding, and the method comprises the steps: taking HDDR neodymium iron boron magnetic powder as a raw material, and enabling the magnetic powder particles to be extruded and sheared with a rolling wheel and the magnetic powder particles to be extruded and sheared with each other through the rolling effect of the rolling wheel, so as to obtain the HDDR anisotropic neodymium iron boron magnetic powder. And the magnetic powder particles which are not completely crushed by hydrogen are forced to be crushed mainly in an intergranular fracture mode, a fresh cross-crystal section is not generated, and meanwhile, the secondary agglomerated magnetic powder particles are dissociated. According to the method and the device for crushing the HDDR anisotropic neodymium-iron-boron magnetic powder for mold pressing bonding, the crushing preparation requirements of a mold pressing bonded magnet on t