METHOD OF PRODUCING HOLES AND COUNTERSINKS IN POLYCRYSTALLINE BODIES

摘要

A method of producing at least one through-hole and countersink in at least one ultrahard insert including the steps of providing a body (28, 30, 32, 34) having a first major surface (12) and an opposite second major surface (14); forming at least one pilot hole (28) in said body using a laser, wherein said at least one pilot hole extends from said first major surface to the opposite second major surface of said body;cutting said pilot hole using a wire electrical discharge machine (WEDM) to produce a straight cylindrical portion (26) and top conical portion (22); forming a countersink (24) on at least one side of said body using an electrical discharge grinding machine (EDG); and severing said at least one ultrahard insert from said body forming a finished insert, wherein said finished insert includes a through-hole and a countersink.