组分对铁基金刚石钻头的力学性能影响研究

Effect of components on the mechanical properties of Fe‑based diamond bits

为提高金刚石钻头钻进钢筋混凝土、强磨性岩层的钻进效率,选择了一种耐磨性高、冷压成型好的铁预合金粉。本文设计了铁基胎体配方,研究了铁基预合金粉、Cu、Ni、Co各成分对铁基金刚石钻头胎体及钻进性能的影响。测试了不同配方下烧结试样的抗拉强度、三点抗弯强度和硬度,使用扫描电镜对断口进行微观分析,通过现场钻进实验测试钻头的钻进效率与寿命。同时分析了保温时间对铁基胎体力学性能的影响。结果表明:Cu、Ni、Co对铁基胎体的抗弯强度和硬度影响较大,且保温时间为5 min时,铁基胎体可以获得较好的力学性能。

To improve the drilling efficiency of diamond bits in reinforced concrete and strong abrasive rock,a pre‑alloyed Fe powder with high wear resistance and cold pressing molding ability was selected for the matrix.The formulas of Fe matrix were designed to research the effect of Fe‑based pre‑alloy powder,Cu,Ni and Co on the matrix and drilling properties of the diamond drill bits.Analysis was conducted of the tensile strength,three‑point bending strength and hardness of the sintered samples of different formula,and the ruptures of the sintered samples were investigated with SEM.The drilling efficiency and life of the drill bits was field tested.The effects of heat insulation time on the mechanical properties of Fe‑based matrix were also analyzed.The results showed that Cu,Ni and Co had a great influence on the bending strength and hardness of the Fe‑based matrix,and the mechanical properties of the Fe‑based matrix can be improved when the insulation time was 5min.