| 摘要 |
A method of making a drill blank (38) which is elongate and has a vein (40) of an abrasive layer located in an end surface (42) thereof. The method includes the steps of: (i) providing a cemented carbide body (10) having a recess (18) formed in a surface (12) thereof, (ii) placing a layer (24) of ultra-hard abrasive or a mass (24) of ultra-hard abrasive particles on a surface (22) of the recess (18), (iii) inserting a cemented carbide piece (16) having the same shape and cross-sectional size as the recess (18), into the recess (18), (iv) subjecting the cemented carbide body (10) 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 (24) of ultra-hard abrasive to the carbide, and (v) severing the cemented carbide body (10) through the abrasive compact layer (24) or layer (24) of ultra-hard abrasive to produce one or more drill blanks (38). <IMAGE> |
