强化热压烧结孕镶金刚石钻头试验研究

在分析常规热压方法不足的基础上,通过试验表明提高热压温度与烧结压力可以有效提高孕镶金刚石钻头的力学性能。针对强化热压方法的特点,设计专用的预合金粉胎体材料体系进行烧结试验,并对其进行硬度、耐磨性与密度测试。试验结果表明,相较于普通热压试件而言,强化热压烧结的试样硬度平均提高约HRC 1.8,磨损量平均下降约2.1 mg,密度平均提高1.23%;野外钻进试验表明,强化热压钻头与普通热压钻头的钻进时效基本持平,但使用寿命平均提高了14.4m/个。试验结果表明强化热压方法具有明显的优势,可以兼顾高效与长寿命的钻进效果,为研究高性能的孕镶金刚石钻头打下了良好的基础。

Experimental study on the impregnated diamond bit fabricated by intensive hot-press sintering

On the analysis of the deficiency of conventional hot-pressing method,it is shown that to increase sintering temperature and pressure can effectively improve the performance of impregnated diamond bit.In view of the characteristics of the intensive hot-pressing method,a special metal matrix system composed of pre-alloy powders is designed for sample fabrication,and Rockwell hardness,wear resistance and relative density of the samples are measured successively.Compared to the samples fabricated by conventional hot-pressing method,the Rockwell hardness and relative density of the samples fabricated by the intensive method are generally increased by HRC 1.8 and 1.23%respectively,while the wear resistance of the intensive samples are generally decreased by 2.1 mg.Field drilling test indicates that the average service time of intensive fabricated drill bits is increased by 14.4 m compared to the convention bits,though their average rate of penetration is roughly equaled to the conventional bits.Test result shows that the intensive hot-pressing method has an obvious advantage,which can simultaneously take into account the drilling performance of high rate of penetration and long service time.It provides a good foundation for the study of high performance of impregnated diamond bits.