| 摘要 |
PURPOSE:To enhance the degree of freedom of the shape of produced parts and to simplify the structure of dies by heat-treating a green compact contg. embedded vanishable core in a sintering furnace. CONSTITUTION:A powdery mixture 14 of metal powder with a lubricant, etc., is filled into a shallow cavity 13 on a lower punch 12 in a die 11 and slightly pressed. A vanishable core 17 is put on the resulting preliminary green compact 16 and other powdery mixture 18 is filled into the space on the core 17 and pressed with the lower punch 12 and an upper punch 15 under a prescribed pressure to form a rectangular green compact 19. This compact 19 is heat- treated in a sintering furnace. The core 17 melts and a sintered alloy body 20 having a circular groove 21 can be obtd. |
