硬质合金钻头钻削球墨铸铁的切削性能研究

Research on Cutting Performances of Carbide Drills when Drilling Ductile Iron

在观察磨损形貌的基础上,分析硬质合金钻头在加工球墨铸铁时的主要磨损形式。在设定轴向力极值、将磨损标准量化之后,推算出刀具寿命预测公式,并得出结论,在钻削QT600牌号的球墨铸铁曲轴时,硬质合金钻头的主要磨损形式为钻尖磨损,相应的轴向力极限推荐值为5500N。除了大长径比和大直径钻头以外,对于大部分钻头而言,刀具寿命预测公式与实际寿命误差在10%以内。

By basing on observing the wear appearances,research on tje wear abrasion reasons of carbide drill when drilling duetile iron. We quantify the wear abrasive standard by setting axial -foree extreme value and then deduce the tooling life forecast formula. The conclusions are followed： when drilling the QT600 ductile iron crankshaft, the worst wear abrasion happens on the drill tip and the recommended axial -force extreme value are 5500N. For most drills except with large draw ratio and diameter ones, the error ratio between forecast tool lives and real ones are within 10%.