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Ndfeb magnet manufacturers processing technology of airflow grinding powder

by:Newland     2020-05-07
Ndfeb magnet manufacturers of ndfeb magnet jet mill has a variety of structural types. Feed grinding materials used in 3 d set up a number of the airflow nozzle spray transfer impact energy, and air flow in fluidized bed expansion of suspension churning collision, friction, crushing, and rising air currents driven by the top set of turbine grading device, fine powder discharge closed to separation and recovery, coarse powder by gravity settling back to crushing zone continue to crush. Assume two quality for yn spherical particles, using high speed air flow to its acceleration, relative direction along the same lines, such as both ball collision speed to Y / = 1. 50 c, two goals at this time with the same energy, E = l / 2 myzq - namely ~ rd2 mNdFeB in/type in the original quality of the powder particles, kg; DNdFeB original powder particle diameter, m; Ab - Surface energy density, J/m9; Dc speed of sound, 16 ~ C in the air, to recognize = 340 m/s set into the original powder manufacturer of ndfeb magnet magnet airflow grinding powder of 246 TLM ( 60 mesh) 。 The diameter of the o. After 32 mm particle collisions, broken into 4 PM s 5/10 of a particle diameter, according to the estimate the energy change of particles before and after the collision. General metal surface energy density between 18 j/m2, it depends on the internal interatomic bonding property of metal and metal melting point. If the assumption of NdFeB powder particles broken surface before and after the density of 2 j/m2, then the total surface energy of the particles before and after the broken 10 - Increased to 10-7 j SJ orders of magnitude. A diameter of 0. 32 mm particles, when the rate of Y = 1. 50 c, about 18 x10 - its kinetic energy - - - - - - 3J。 Description two powder particles collide, the surface energy is very small, mainly in the huge momentum, under the action of particle breaking into a fine powder. When two particles collide, only a small part of its kinetic energy into surface energy, part of the consumption in fractured particles, and most are converted into sound energy, heat and lattice distortion energy.
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