Patent ID: 8870560
Filing Date: 2014-10-28
Classification: B22F,C22C,H01F

Abstract:
1. A NdFeB system sintered magnet production system for putting a NdFeB system alloy powder into a mold cavity of a mold which has been designed to correspond to a shape and dimensions of a product to a predetermined filling density within a range of 3.0 to 4.2 g/cm 3 and magnetically orienting and sintering the alloy powder being held in the mold cavity to produce a NdFeB system sintered magnet having the desired shape and dimensions, comprising: a) a first weight measurer for measuring a weight of the mold before the alloy powder is put into the mold; b) a supply cavity forming unit for providing the mold with a guide so as to extend the mold cavity to form a supply cavity with a predetermined volume; c) a supplier for supplying the alloy powder into the supply cavity while adjusting a supply density so that a volume of the alloy powder is equal to a capacity of the supply cavity; d) a densifier for pressing the alloy powder which has been supplied into the supply cavity into the mold cavity so as to densify the alloy powder to the filling density; e) a second weight measurer for measuring a weight of the mold after being filled with the alloy powder by the densifier; and f) a controller for computing a weight of the alloy powder which has been put into the mold cavity based on a difference between a measurement value from the first weight measurer and that of the second weight measurer, and, based on the computed weight, performing a feedback control of an alloy powder supply operation performed by the supplier.