B - Operations – Transporting – 23 – B
Patent
B - Operations, Transporting
23
B
B23B 51/00 (2006.01) B22F 7/06 (2006.01) B23B 27/14 (2006.01) B23P 5/00 (2006.01) B23P 15/28 (2006.01) E21B 10/56 (2006.01)
Patent
CA 2245952
A method of making a drill blank which is elongate and has a vein of an abrasive layer located in an end surface thereof. The method includes the steps of: (i) providing a cemented carbide body having a recess formed in a surface thereof, (ii) placing a layer of ultra-hard abrasive or a mass of ultra-hard abrasive particles on a surface of the recess, (iii) inserting a cemented carbide piece having the same shape and cross-sectional size as the recess, into the recess, (iv) subjecting the cemented carbide body to conditions of elevated temperature and pressure suitable to form an abrasive compact of the abrasive particles, when used, and bond such compact or the layer of ultra-hard abrasive to the carbide, ;end (v) severing the cemented carbide body through the abrasive compact layer or layer of ultra-hard abrasive to produce one or more drill blanks.
de Beers Industrial Diamond Division (proprietary) Limited
Element Six (pty) Ltd
Gowling Lafleur Henderson Llp
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