CFRP/钛合金叠层界面过渡域非均衡制孔机理及表面控性研究

项目名称： CFRP/钛合金叠层界面过渡域非均衡制孔机理及表面控性研究

项目编号： No.51475379

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 机械、仪表工业

项目作者： 刘书暖

作者单位： 西北工业大学

项目金额： 80万元

中文摘要： 随着CFRP/钛合金叠层结构在航空航天等领域的应用由一般零件向主承力关重件发展，对其结构强度和疲劳等要求越来越苛刻，该结构装配的连接孔质量是影响结构强度和疲劳的关键。叠层界面过渡域制孔过程中存在沿刀刃方向受力不同、旋转周期内受力不同、摩擦磨损状态不同、切削热引起孔热胀冷缩不同等非均衡问题。针对这些问题，采用理论探索、实验研究和计算仿真等方法，分析界面过渡域钻削行为、非均衡受力状态、摩擦磨损现象等；建立界面过渡域制孔过程的非均衡力学模型、切削力动态变动模型和摩擦磨损引起的表面粗糙度演变模型等；揭示过渡域制孔力学状态、切削力动态作用规律、表面质量形成规律和孔壁与刀具刀刃的摩擦磨损规律等，进而有效控制界面过渡域的制孔缺陷和表面特性，实现界面过渡域制孔均衡优化设计，提升CFRP/钛合金叠层界面过渡域制孔质量的稳定性和一致性，为该结构更加安全、可靠服役的设计制造决策提供基础理论与方法。

中文关键词： 难加工材料；切削机理；切削力；刀具磨损；表面质量

英文摘要： CFRP/Ti laminated structure has been applied deeply from the common part to the key loaded component in the aerospace industry so the strength and the fatigue life of the structure are becoming more demanding. The quality of the connecting hole for assembly is the key to influence the strength and the fatigue. But, in the hole making process of the stack interface transition zone, there are non equilibrium states including the stress state along the direction of the cutting edge, the stress state in the rotation cycle, friction and wear state, thermal expansion and contraction caused by cutting heat etc.. Therefore, the method of theory exploring, test research and computational simulation is adopted to analysis the drilling behavior, non equilibrium state of stress, friction and wear etc. in the stack interface transition zone; build the non equilibrium mechanic model, dynamic cutting force model, and surface roughness evolution model; reveal the mechanical state of the transition zone, dynamic cutting force law, the formation law of the surface quality and the friction and wear law between the hole wall and cutter blade etc. to effectively control the hole defects and surface characteristics, realize the equilibrium and optimized hole making design in the stack interface transition zone. Finally, theory and method are provided to guarantee the quality of the hole, the safe and reliable service of the stack structure.

英文关键词： Hard processing materials;Cutting mechanism;Cutting force;Tool wear;Surface quality