| 摘要 |
A method of making a drill blank which is elongate and which has a vein of a bonding material located in an end surface thereof. A recess is formed in a surface of a cemented carbide body. Either a layer of ultra-hard abrasive or a mass of ultra-hard abrasive particles is then placed on a surface of the recess. A cemented carbide piece, having the same shape and cross-sectional size as the recess, is inserted into the recess. The cemented carbide body is subjected to conditions of elevated temperature and pressure so that either the abrasive compact layer or the layer of the ultra-hard abrasive bonds the cemented carbide piece to the cemented carbide body. Finally, the cemented carbide body is severed through either the abrasive compact layer or layer of ultra-hard abrasive to produce one or more drill blanks.
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