| 摘要 |
A machine for compacting metal powder comprises a static frame, a die having a bore, a lower punch defining a receiving die cavity in the bore, an upper punch, an upper punch downwardly movable to enter the die cavity, and a reaction frame to which the lower punch is fixed slidably mounted on the static frame, the reaction frame and the lower punch being moved upwardly by a reaction force generated when the upper punch is moved downwardly. The die is moved upwardly after the die cavity has been filled with powder a distance at least equal to the upward movement of the lower punch completed before the upper punch enters the die cavity, and the die is moved downwardly after the upper punch has entered the die cavity.
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