新型非平面齿破岩规律研究

Research on Rock Breaking Law of New Non Planar Cutter

为了提高聚晶金刚石复合片(PDC)切削齿的破岩性能,设计了一种新型非平面齿,建立了该齿的破岩仿真模型,研究了新型非平面齿的脊长、脊倾角、斜角、切削深度和前倾角对其破岩规律的影响,结果表明:新型非平面齿的内切削刃使岩石产生体积破碎,其破岩效率高于屋脊齿;新型非平面齿的破岩比功和切削力随着脊长的增加呈现出先增大后趋近不变的趋势;新型非平面齿的切削力和破岩比功随脊倾角的增大而增大;新型非平面齿的破岩比功和切削力随斜角的增大而减小,考虑到齿刃的寿命,斜角应取10°~20°;新型非平面齿的破岩比功随吃入深度的增大而减小,最优吃入深度应大于其脊长;新型非平面齿的切向力和破岩比功随前倾角的增大呈现先减小后增大的趋势,最优前倾角是15°。

In order to improve the rock breaking performance of PDC cutters,we designed a new non planar cutter and established the rock breaking finite element simulation model of this new non planar cutter.On the basis of this,we studied the rock breaking process of the new non planar cutter and the effects of ridge length,ridge inclination,bevel angle,depth of cut and rake angle on the rock breaking specific energy of the new non planar cutter.The research results show that the concave curved surface in the middle of the new non planar cutter makes the rock volume broken,and its rock breaking efficiency is higher than that of the ridge teeth;With the increase of ridge length,the rock breaking specific energy and cutting force of the new non planar cutter show a trend of increasing at first and then approach the same trend;The rock breaking specific energy and cutting load of the new ridge cutter decrease with the increase of the bevel angle.Considering the service life of the cutter edge,the bevel angle should be 10°~20°;The cutting force and rock breaking specific energy of the new non planar cutter increase with the increase of ridge inclination;With the increase of cutting depth,The rock breaking specific energy of the new non planar cutter increases firstly and then decreases,and the optimal cutting depth should be greater than the length of its ridge;The cutting force and rock breaking specific energy of the new non planar cutter first decrease and then increase with the increase of rake angle,and the optimal rake angle is 15°.