PDC切削齿破岩受力的试验研究

试验模拟了切削面积、接触弧长、切削面形状、切削齿后倾角和岩石性能对PDC切削齿破岩受力的影响。结果表明,采用接触弧长、切削面积和岩石可钻性表征切削面的几何形状和岩石性能与PDC切削齿破岩的实质相符。PDC切削齿单位切削面积上的切向力和正压力随着接触弧长、切削面积、切削齿后倾角和岩石可钻性级值的增大而增大,并与切削面积与接触弧长的乘积呈显著的线性关系。当后倾角小于10°时,切削齿受力较小。根据试验结果,建立了PDC切削齿破岩的受力模型。

Experimental study on force of PDC cutter breaking rock

The effects of cutting area,contact arc length,the geometry of cutting face,back dip angle of PDC cutter and rock performance on force of PDC cutter breaking rock were simulated experimentally.The results show that it conforms to the essence of PDC cutter breaking rock that adopting contact arc length,cutting area and rock drillabillity as the characteristic parameters of the geometry property of cutting face and rock performance.The tangential and positive forces on unit cutting area of PDC cutter increase with the increase of contact arc length,cutting area,back dip angle of PDC cutter and rock drillabillity class.The mathematical relationship between the tangential and positive forces on unit cutting area and the multiplication of cutting area and contact arc length is obvious linear.When back dip angle is less than 10 degrees,the force on PDC cutter is relatively less.According to the experimental results,the force model of PDC cutter breaking rock was developed.