Composite powder filling method and composite powder filling device, and composite powder molding method and composite powder molding device

A process for compacting a multi-powder, comprising the steps of:

• moving a powder box, being disposed movably on a table and comprising a plurality of powder chambers, said powder chambers separated by partition plates on the inside of said powder box, storing a plurality of powders whose constituent compositions differ in a divided manner and having a bottom opening, onto a compacting die forming a cavity into which the powders are filled;
• filling a plurality of the powders into the cavity at once through the bottom openings by introducing a gas into the powder chambers to substantially equalize the respective flow resistances of a plurality of the powders, at least when the bottom openings are positioned above the cavity by the powder box moving step;
• and
• producing a multi-powder compact by pressurizing a multi-powder comprising a plurality of the powders after the filling step,
• wherein a gas flow Vg (mL/s) to be introduced into said powder chambers is such that an aeration value Vg/Vp, a ratio with respect to the volume Vp (mL) of the powders in the powder chambers, is from 0.1 to 0.3 (1/s) in each of said powder chambers,
• wherein said gas is introduced through an introducing hole disposed on the outer peripheral side of a gas feed pipe for feeding the gas into each of said powder chambers, and a gas feed pipe for each of said chambers is disposed on the bottom side each of said powder chambers;
• wherein said aeration value is set per each of said powder chambers;
• and
• wherein each of said powder chambers comprises a flow-resistance measuring device, wherein the flow resistance of said gas is measured independently in each of said powder chambers.