数值模拟在陶瓷粉末材料冷等静压过程中的应用

Application of numerical simulation in cold isostatic pressing of ceramic powder materials

为了解释陶瓷粉末件低密度缺陷的形成原因,借助有限元分析软件MSC.MARC对陶瓷粉末件的冷等静压(CIP)成形过程进行了有限元数值模拟,从数值计算的角度给出了成形过程中粉体的应变分布、密度分布规律,并提出了改善陶瓷粉末件低密度现象的对策.研究结果表明:在CIP成形过程中芯棒顶端倒角处变形受到抑制,等效应变最大,相对密度最小,出现变形不均匀现象;粉末构件的几何形状、尺寸、模具形状对低密度区域的形成有较大影响.

The FEM numerical simulation to imitate the CIP process of ceramic powder components is intro-duced by the aid of the FEM software MSC.MARC.The formation mechanism of low-density defects in the powder component s is studied.The distributions of strain field and density have been calculated.The defor-mation at top facet of a mandril is restrained with the largest strain and lowest density subsequently.It is shown that the geometry of powder components and the shape of die s cause the formation of low-density area.