液氮低温冷却钻削叠层复合材料的有限元仿真分析与试验研究

Finite Element Simulation Analysis and Experimental Research on Liquid Nitrogen Cryogenic Cooling Drilling Laminated Composite Materials

为探究碳纤维与钛合金的叠层复合材料(CFRP/Ti)在干式钻削和液氮低温冷却钻削情况下对轴向力、钻削温度和工件加工质量的影响规律,基于ABAQUS有限元分析软件,结合Hashin、Puck强度理论、J-C本构、状态变量和单元删除控制,建立了硬质合金刀具在液氮冷却条件下钻削CCF300/QY8911叠层复合材料的三维仿真模型,以实现对叠层复合材料的钻削轴向力、钻削温度、钻削出口毛刺高度和复合材料拉伸损伤、分层缺陷的分析。针对钻削轴向力、钻削温度和钻削出口毛刺高度开展验证性试验,从三维仿真结果中可知,在液氮低温冷却加工的情况下,钻削CFRP/Ti的轴向力水平更高,钻削温度更低,出口的毛刺高度更低,孔边和孔壁应力集中现象减少,复合材料表面的拉伸和分层损伤减少。通过低温冷却钻削试验,验证液氮低温冷却情况下钻削轴向力、钻削温度和孔出口毛刺高度的变化情况,与仿真结果相比具有较好的一致性,对超低温冷却加工具有指导意义。

In order to explore the effect of carbon fiber and titanium alloy laminated composite material(CFRP/Ti) on the axial force, drilling temperature and workpiece processing quality under the conditions of dry drilling and liquid nitrogen cryogenic cooling drilling Based on ABAQUS finite element analysis software, combined with Hashin, Puck strength theory, JC constitutive, state variables, and element deletion control, a three-dimensional simulation of drilling CCF300/QY8911 laminated composite materials with cemented carbide tools under liquid nitrogen cooling is established model.Realize the analysis of the drilling axial force of the laminated composite material, the drilling temperature, the height of the burr of the drilling exit, and the tensile damage and delamination defect of the composite material.And carry out confirmatory tests for the drilling axial force, drilling temperature, and drilling exit burr height.It can be observed from the three-dimensional simulation results that, in the case of liquid nitrogen cryogenic cooling processing, the axial force level of drilling CFRP/Ti is higher, the drilling temperature is lower, the burr height at the exit is lower, and the edge and wall of the hole The stress concentration is reduced, and the tensile and delamination damage on the surface of the composite material is reduced.Subsequently, the low-temperature cooling drilling experiment was conducted to verify the changes in the drilling axial force, the drilling temperature and the height of the hole exit burr under the liquid nitrogen low-temperature cooling, which are in good agreement with the simulation results, and are practical for ultra-low temperature cooling processing guiding significance.