|
PART SIZE
Wide parts are possible if perpendicular dimensions are reduced so that
the maximum projected area is not exceeded. At higher press tonnages, 560
MPa (40 tsi), for example, the projected die/punch area will shrink, and
a 200-ton press will have a maximum round die diameter of 64.0 mm (2.52 in.).
- Since compaction occurs in the vertical direction,
using only top and bottom motions, part lengths in the pressing direction are
limited.
- Compression ratio—the ratio of the height of
the loose powder filling the die to that of the compacted part—also tends
to limit vertical part lengths.
SHAPES
- Shapes with uniform dimensions in the pressing
direction are easiest to produce and eject from the press.
- Cams, gears, and sprockets are readily made.
- Thin walls and projections should be considered
carefully, since they may require fragile tools.
- Face forms on upper or lower punches can provide
bosses, pads, lettering, countersinks, and other features.
MULTI-LEVEL
SHAPES
- More complex, multi-motion tooling is required
maintain consistent density throughout parts with more than one level.
- Both mechanical and hydraulic presses are available
for making parts with five or more levels.
- Parts weighing from a few grams to 11.8 kg (26
lbs.) or more are possible.
|
|
|
