Process for drilling chamfered holes

Details Process for drilling chamfered holes Process for drilling chamfered holes

1988-03-21

1989-04-04

Valentine, Donald R.

Electric heating

Metal heating

Cutting or disintegrating

2041293, 20412935, 20412955, 21912171, B23H 100, B23H 502, B23H 914, B23K 2600

Patent

active

048188344

ABSTRACT:
A process for drilling chamfered holes includes the steps of directing noncontact energy onto the outer surface of the part to form a recessed crater-like entrance with chamfered walls and thereafter directing a small diameter wire electrode adjacent the substrate and spark eroding the base without removing material from the chamfered walls so as to produce a combined passage through the part with a chamfered entrance leading to a smaller outlet. In one embodiment the part has a ceramic coating which is initially removed from the part by either focusing a laser beam to a penetration depth which removes the ceramic coating while forming the entrance and in another embodiment the coating is initially removed by imposing a high voltage pulse thereagainst from a spark erosion electrode of electrical discharge machining equipment.

REFERENCES:
patent: 3431389 (1969-03-01), Tudor et al.
patent: 3816272 (1974-06-01), Joslin
patent: 4045311 (1977-08-01), Matsui et al.
patent: 4283259 (1981-08-01), Melcher et al.

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