数值模拟在氧化铝陶瓷SLS／CIP过程中的应用

摘要

采用选择性激光烧结（SLS）和冷等静压（CIP）复合工艺制造高密度形状复杂的氧化铝零件，经高温烧结，氧化铝零件密度高达94．5％．应用修正的Cam-Clay模型模拟了零件的CIP过程，同时通过模拟和实验研究其在CIP过程中的致密化、变形及收缩规律．研究表明，在激光扫描平面内模拟与实验的尺寸相对误差不超过2．26％，证明该模拟可为氧化铝SLS零件的尺寸设计和CIP过程提供有利指导．%In order to manufacture high-density complex alumina components, the combined process of Selective Laser Sintering (SLS) and Cold Isostatic Pressing (CIP) were utilized. The density of part reached 94.5% after high temperature sintering. The modified Cam-Clay model was used to simulate the CIP process. Meanwhile, the discipline of densification, deformation and shrinkage of alumina parts in the CIP process were studied by both experiments and simulation. The simulation results indicate that the dimensional relative error is less than 2. 26% in the laser scanning plane, which demonstrates the simulation can offer favorable instructions to the design of SLS alumina part dimensions and its CIP process.