MANUFACTURE OF MANGANESE-ALUMINUM-CARBON ALLOY MAGNET

摘要

PURPOSE:To obtain a magnet for multipolar magnetization having excellent magnetic properties, by a method wherein a hollow billet is axially subjected to compression in the state where the outer periphery of the billet is restricted but the inner periphery thereof is free. CONSTITUTION:A cylindrical billet 1 made of a manganese-aluminum-carbon alloy for magnet is restricted at its outer periphery by means of an outer die 4 and pressed by means of punches 2 and 3. With the outer periphery of the billet 1 restricted but the inner periphery thereof allowed to be free, the billet 1 is axially subjected to compression and is then further partially subjected to an axial compression. Thus, it is made possible to obtain a magnet for multipolar magnetization having excellent magnetic properties.