| 简介 |
PROBLEM TO BE SOLVED : To obtain a magnet of a rare earth element causing neither seizing nor cracking, capable of being sufficiently extruded, hardly deteriorating magnetic characteristics, by cold pressing powder of magnet alloy to prepare a compact, coating the whole surface of the compact with a lubricant and continuously carrying out hot pressing and extrusion. SOLUTION : An ingot obtained by casting a molten metal comprising a rare earth element, an iron-group element and boron is ground to give powder of magnet alloy having . The process is shown in the figure. A container 4 is arranged in a space formed by a die 1, a lower punch 2 and an upper punch 3, the compact 5 coated with the lubricant is put in the space and hot pressed and extruded. An outer punch 6 is installed at the free end of the extrusion. |
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