| 摘要 |
A press for producing parts, such as high precision ceramic parts or powder metal parts, by compaction of material. The press comprises a frame having a longitudinal axis, a die and a punch assembly mounted on the frame, and a motion assembly adapted to move the punch assembly relative to the die along the axis. The punch assembly comprises a plate and a punch held by the plate and extending along the axis. The plate comprises a central portion via which the axis passes and distal portions on two sides of the central portion. The motion assembly comprises two linear motion mechanisms, each comprising a threaded shaft with a portion thereof received within one of the distal portions, and a nut assembly mounted on the threaded shaft and engaging the distal portion within which the threaded shaft is received. Each nut assembly comprises a nut housing surrounding a portion of the threaded shaft, and a plurality of ribbed rollers disposed therebetween in a planetary arrangement and engaging both. The rotational motion is provided to either both of the nut assemblies or both of the threaded shafts, causes linear motion of the punch assembly with the punch along the axis, for the compaction of powdered material contained within the die.
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