热压铁基金刚石钻头胎体性能及钻进试验研究

Study on matrix performance of iron-based diamond bit and drilling tests

本文以铁替代碳化钨作为钻头骨架材料,研究了新型热压铁基金刚石钻头的胎体性能,包括胎体硬度和耐磨性。通过对胎体性能试验结果的回归分析和非线性规划求解,得到了胎体硬度及耐磨性与胎体配方各组分之间的回归模型,并得出了优化的胎体配方。优化配方计算表明胎体硬度的最优值为139.5 HRB,耐磨性的最优值为0.056 g,但二者不能同时达到最优值。最后采用优化的配方试制了两组φ41/27 mm普通金刚石钻头,在可钻性为9级的花岗岩上进行实际钻进试验,取得了平均时效为2.04 m/h的好效果。

Taking iron powder as the alternative of tungsten carbide in matrix composition, a new type of hot pressed iron-based bit matrix was studied in respect of its hardness and wear resistance. Regression models of matrix composition on matrix hardness and wear resistance were obtained respectively in addition to an optimized matrix formula through regression analyses on experimental results and constrained nonlinear programming. The results of nonlinear programming revealed that the predictive optimum value of hardness was 139.5 HRB and the optimum wear resistance was 0. 056 g, whereas they could not reach the optimum value at the same time. Finally, two φ 41/27 mm common diamond bits were designed and then manufactured based on the two optimum matrix formulae to perform drilling tests in granite with drillability of grade 9. The average penetration rate of the two diamond bits was 2.04 m/h.