Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Heat and pressure simultaneously to effect sintering
Patent
1982-07-12
1985-07-02
Miller, Edward A.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Heat and pressure simultaneously to effect sintering
419 48, 419 8, 428553, B22F 314
Patent
active
045267480
ABSTRACT:
An assembly and method for hot consolidating powder metal by heat and pressure in a container. The container is a mass of material substantially fully dense and incompressible with at least a portion which is capable of plastic flow at pressing temperatures and forming a closed cavity of a predetermined shape and volume for receiving a quantity of powder metal with the interior walls being movable to reduce the volume of the cavity for compacting powder metal into an article. A shaping insert is disposed in the cavity for defining a void in the article as the powder metal is compacted against the shaping insert. A force-responsive means allows relative movement between the shaping insert and at least a portion of the interior walls of the cavity as powder metal is compacted in response to a force reducing the volume of the cavity. In one embodiment the force-responsive means takes the form of a deformable projection extending from the shaping insert into a recess in the cavity whereby the projection will be deformed in response to a predetermined force to allow the shaping insert to move relative to the interior cavity walls. In another embodiment the shaping insert is supported by a press fit whereby the shaping insert is allowed to move in response to a predetermined compacting force. The force applied to the container may be applied by gas pressure in a gas autoclave or by pressing the container to cause plastic flow of the container mass.
REFERENCES:
patent: 3773506 (1973-11-01), Larker et al.
patent: 3844778 (1974-10-01), Malone et al.
patent: 4142888 (1979-03-01), Rozmus
patent: 4255103 (1981-03-01), Rozmus
Hirschhorn, Introduction to Powder Metallurgy, (1969), APMI, pp. 98-107.
Brookes Anne
Kelsey-Hayes Company
Miller Edward A.
Milton Jr. Harold W.
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