Method for manufacturing dimensionally correct compacts

Details Method for manufacturing dimensionally correct compacts Method for manufacturing dimensionally correct compacts

1990-06-15

1991-06-18

Lechert, Jr., Stephen J.

Powder metallurgy processes

Forming articles by uniting randomly associated metal particles

Consolidation of powders

264109, 264120, 264500, 425 78, B22F 700

Patent

active

050248111

ABSTRACT:
Precision compacts are produced from powdered material in a mold having at least one top plug and at least one bottom plug between which plugs the powdered material is compressed. The course of the pressing force of at least one of the plugs is detected as a function of the path of its travel during compression, and compared with a predetermined path-dependent tolerance range of the pressing force. Upon exceeding such tolerance range, the final pressing position of the plug in question is changed in such a manner that the height of the compact in such final pressing position is reduced by an amount corresponding to the increased springing back of the compact upon its removal from the mold that results from the greater final pressing force. In the absence of exceeding such tolerance range, the final pressing position of the plug in question is changed in such a manner that the weight of the compact in such final pression position is increased by an amount corresponding to the decreased springing back of the compact upon its removal from the mold that results from the lesser final pressing force.

REFERENCES:
patent: 3698843 (1972-10-01), Bowles et al.
patent: 4472350 (1984-09-01), Urano

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