Surface degradation mechanisms of cemented carbide drill ...
2017-10-15 · The drill bits used had a diameter of 116 mm and were equipped with 7 front and 10 peripheral cemented carbide buttons (ø 14 mm) with a semi ballistic shape, see Fig. 1. In operation, using a water pressure of 180 bar, the drill rotates at approximately 70 rpm and impacts the iron ore around 65 times/s.
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