Conventional Die Compaction

In order to use die-compaction technology effectively, the designer must be familiar with the limitations and design constraints related to product shape and special features. A shape or feature can be die compacted provided that (a) it can be ejected from the tooling and (b) the tools that form the feature have sufficient strength to withstand the repeated compaction loads. Due to the vertical closure of the tooling and the lack of tool motions perpendicular to the pressing direction, part removal from the tools controls many features. Examples of features that cannot be accommodated in die compaction, and therefore require secondary machining operations, include undercuts, reverse taper (larger on bottom than on top), annular grooves, and threads.

The specific design issues for the powder process technologies would require an extensive discussion well beyond the limits of this article. An excellent source for additional details is the manual on P/M product design prepared by the Metal Powder Industries Federation (MPIF) trade association (Ref 8). Additional information on tooling and part design is also included in the article "Powder Metallurgy Presses and Tooling" in this Volume.

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