Polycrystalline diamond bit manufacturing

Details Polycrystalline diamond bit manufacturing Polycrystalline diamond bit manufacturing

1996-08-19

1998-06-09

Mai, Ngoclan

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Making composite or hollow article

419 18, 419 38, 419 42, 419 65, 419 68, B22F 708

Patent

active

057650950

ABSTRACT:
A method for manufacturing a PCD bit by isostatically or mechanically press forming a green on a metallic blank. A metallic blank is vertically suspended into a flexible vessel. Powder metal is mixed with a binder and introduced into the flexible vessel surrounding the lower end of the suspended metallic blank. The vessel is then isostatically or mechanically pressed causing the powder mixture to stick together and to the blank, forming a green on the blank. The blank and green are removed from the vessel and the exposed end of the metallic blank is chucked onto a milling machine and turned for milling the green into the shape of a PCD bit head. After the milling is completed, the green and blank are sintered, hardening the bit head shaped green and strongly bonding it to the metallic blank, forming a PCD bit wherein the hardened green is the bit head while the metallic blank is the bit pin.

REFERENCES:
patent: 4554130 (1985-11-01), Ecer
patent: 4919013 (1990-04-01), Smith et al.
patent: 5000273 (1991-03-01), Horton et al.
patent: 5032352 (1991-07-01), Meeks et al.

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