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刮刀钻头上的硬质合金在制造过程中的高温受热(1280℃烧结和刀片基体钢调质时850℃淬火),是使硬质合金固有的耐磨性降低,从而使钻头进尺减少的重要原因。 为了解决这个矛盾,我们从1973年5月开始试验采用粘合剂将硬质合金胶粘到钻头刀片
The main reason that the carbide on the drag bit is heated during manufacturing (1280 ° C and 850 ° C for the blade base steel) is an important reason for reducing the inherent wear resistance of the hard alloy and reducing the drill footage . In order to solve this contradiction, we started from May 1973 to test the use of adhesive cemented carbide to drill bit