Powder filling method and arrangement therefor
AssigneeHöganäs AB
InventorsPaul Skoglund, Sven Allroth, Hilmar Vidarsson
Life of this patent
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Abstract
A powder box, an arrangement for a powder box comprising an insert and a method for filling powder into a cavity formed in a die. Gas is supplied to a powder box, which is movable toward and away from a position just above the cavity. The gas is supplied through a permeable plate, which is arranged on at least one insert and which faces the interior of the powder box, so that particles of the powder in the powder box are movable relative to each other. The fluidisation of the powder shortens the filling time and results in an even particle size distribution in the cavity.
Claims10
A powder box (2) for filling powder into a cavity formed in a die, having arranged therein at least one insert (20) including a gas permeable plate (21), which faces the interior of the powder box (2) and which is arranged at an angle α >0° relative to the bottom (6) of the powder box (2), a gas impermeable backing (22) and a spacing (23) therebetween, the spacing (23) being connectable to a gas supply through at least one hose (3).
An insert (20) for a powder box (2) comprising a gas permeable plate (21), a gas impermeable backing (22) and a spacing (23) therebetween, the spacing (23) being connectable to a gas supply.
The insert (20) according to any of the claims 57, wherein the gas permeable plate (21) is of a polymer, metall or a ceramic material or a mixture thereof.
A method for filling powder into a cavity (30) formed in a die (31) comprising the steps of:
- a) supplying gas to a powder box (2), which is movable horizontally toward and away from a position just above the cavity (30), whereby the gas is supplied through a permeable plate (21) which is arranged on at least one insert (20), whereby the plate faces the interior of the powder box (2) and is arranged at an angle α, which is >0° C., relative to the bottom (6) of the powder box (2) so that particles of the powder in the powder box (2) are movable relative to each other;
- and
- b) moving the powder box (2) to the position just above the cavity (30) so that the powder in the powder box (2) enters the cavity (30) at least by gravity.
Dependencies are inferred from the claim text.