错齿BTA深孔钻削切屑变形及刀屑接触长度分布规律研究
Exploring Chip Deformation and Tool-chip Contact Length Distribution Laws of Staggered Teeth BTA Deep-hole Drilling

断排屑问题一直是错齿BTA内排屑深孔钻削的难点，通过建立切屑流经断屑台的几何变形模型分析了刀屑接触长度对错齿BTA钻削切屑的变形断裂的影响，采用有限元分析软件DEFORM-3D建立了错齿BTA钻头钻削仿真模型，对各刀齿切屑的形成及变形规律进行了分析，研究了刀屑接触长度随刀齿钻削半径分布规律及其随钻削条件的变化规律，并利用实验对仿真结果进行了验证分析。结果表明，仿真结果可信，刀齿钻削半径对切屑的变形及刀屑接触长度影响很大，刀屑接触长度随钻削进给量增大而增大，随转速增大而减小，随工件材料强度增大而增大。
It is difficult to resolve the chip breaking and discharge in the staggered teeth boring and trepanning association (BTA) drilling. The effect of the tool-chip contact length on chip deformation and breaking in the staggered teeth BTA drilling is analyzed with the geometric deformation model of chip breaking we built in the paper. We adopt the finite element method (FEM) simulation software of DEFORM-3D to establish the drilling model for simulation. The rules that govern formation and deformation of every cutting tooth chipping are analyzed; the distribution laws with the drilling radius and drilling condition of the tool-chip contact length are studied. The simulation results are verified by experiments. The results show that the simulation is reliable. The drilling radius has a great influence on the deformation of chips and tool-chip contact length. The tool-chip contact length of the cutting teeth increases with the increase of the feed and material strength and the decrease of the speed