高温合金蜂窝芯冰固持低损伤加工技术研究

针对金属蜂窝芯存在的薄壁多孔、各向异性、面内弱刚性、径向强度小等加工难题，提出了高温合金蜂窝芯冰固持低损伤加工方法。分析了金属蜂窝芯冰固持装夹原理，验证了工艺系统的适应性和可靠性。开展了蜂窝芯冰固持超低温冷却加工的单因素试验，阐明了蜂窝芯加工缺陷形成规律。试验结果表明：在金属蜂窝芯加工中引入冰固持超低温冷却的装夹和加工方式，可降低切削热，实现加工过程中的固持约束保持，从而提高蜂窝壁抵抗变形的能力；切削参数中进给速度对加工质量影响最大，加工缺陷中撕裂毛刺占比最高，采用最优切削参数进行加工可保证低损伤、低粗糙度、无变形的良好加工质量，可实现难加工金属蜂窝芯的高质高效加工。

Research on Ice Fixation and Low Damage Machining Technology of Superalloy Honeycomb Cores

Aiming at the machining problems of metal honeycomb core, such as thin-walled porosity, anisotropy, weak in-plane rigidity and low radial strength, a ice fixation and low damage machining method of superalloy honeycomb core was proposed. The principles of metal honeycomb core ice fixation clamping were analyzed, the adaptability and reliability of the machining systems were verified. A single factor test of honeycomb core ice fixation cryogenic cooling machining was carried out, the forming rule of honeycomb core machining defects was expounded. The results show that the clamping and machining methods of ice fixation cryogenic cooling are introduced in the machining of metal honeycomb cores, the cutting heat is reduced and the fixation constraint retention achieves during machining, which may improve the ability of the honeycomb wall to resist deformation . Among the cutting parameters, the feed rate has the greatest influence on the machining quality, and the tearing burr accounts for the highest proportion of the machining defects. The optimal cutting parameters may ensure good machining quality with low damage, low roughness and no deformation, and may achieve high quality and high efficiency machining of difficult-to-machine metal honeycomb cores.