胎体中含有铜锰阻尼合金成分的金刚石钻头研制及钻进试验

Preparing diamond bit with Cu-Mn damping alloy in matrix and drilling test

孕镶金刚石钻头在钻进过程中,经常会遇到有害的振动问题,这种振动极大地影响钻进的稳定性。阻尼合金能耗散振动能,可达到减振的目的。本实验用铜锰粉末代替63#配方中的663青铜粉,来制作金刚石钻头的胎体试样。对胎体试样进行力学性能测试及断口形貌分析,结果表明:相较于63#配方试样,质量分数40%铜锰粉末的胎体试样组织均匀,结构致密,硬度提升14.7%;孕镶金刚石钻头磨耗比提高13.2%,抗弯强度降低22.4%。钻进试验结果表明:在钻进均质花岗岩岩样时,质量分数40%的铜锰配方钻头与63#配方孕镶金刚石钻头钻进性能相近,钻进振动加速度幅度减小约4.3%,钻头阻尼性能提高,钻进过程更加平稳。

Harmful vibration often occurs in the drilling process of impregnated diamond bit,which greatly affects the stability of drilling.Copper-manganese damping alloy can dissipate vibration energy and achieve the purpose of damping vibration.Therefore,copper-manganese powder is used to replace 663 bronze powder in63#formula to make matrix sample and hence diamond bit.The results of mechanical properties test and fracture morphology analysis show that compared with 63#formula sample,the matrix sample with 40 wt%copper-manganese powder has uniform microstructure,compact structure and 14.7% hardness increase.The wear ratio of impregnated diamond bit increases by 13.2%,and the bending strength decreases by 22.4%.The drilling test results show that the drilling performance of Cu-Mn formula drill bit with 40 wt% Cu-Mn is similar to that of 63#diamond drill bit,while the drilling vibration acceleration amplitude is reduced by 4.3%.Therefore,drilling damping performance is improved,and the drilling process is more stable.