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Metal Powder Compression

Powder compaction(PM)
is the process of compacting metal powder in a die with the help of high pressures. Typically the tools are held in the vertical orientation with the punch tool forming the bottom of the cavity. The powder is then compacted into a shape and ejected from the die cavity. Generally speaking, parts may require very little additional work which makes the manufacturing cost efficient.

The density of the compacted powder is directly proportional to the amount of pressure applied. Typical pressures range from 80 psi to 1000 psi, but pressures from 1000 psi to 1,000,000 psi are also possible to get. The pressure of 10 tons/in2 to 50 tons/in2 is commonly used in metal powder compaction. In order to attain the same compression ratio across a component with more than one level or height, it is necessary to work with multiple lower punches. A cylindrical workpiece is made by single-level tooling; more complex shape can be made by the common multiple-level tooling. The production rates from 15 to 30 parts per minute

There are four major classes of tool styles: single-action compaction used for thin, flat components; opposed double-action with two punch motions used for thicker components; double-action with floating die; double-action withdrawal die. In general, double-action classes give much better density distribution than single action. Tooling must be designed so that it will withstand the extreme pressure without deforming or bending. Tools must be made from materials that are polished and resistant.

Related Tags : PM powder metallurgy powder compression

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