橡胶辅助热压印成型的数值模拟

Numerical Simulation of Rubber-assisted Hot Embossing

采用硅橡胶替代传统下模具,压印成型聚甲基丙烯酸甲酯(PMMA)制品。硅橡胶的本构模型和PMMA的材料模型分别采用Mooney-Rivlin模型和广义Maxwell模型,通过单轴拉伸试验确定不同硬度硅橡胶的材料参数。利用有限元仿真软件ANSYS模拟PMMA制品成型过程,研究压力载荷、压印温度和硅橡胶硬度对PMMA变形的影响。结果表明:随着压力增大、压印温度升高,微沟道深度增大;硅橡胶硬度越小,PMMA成型效果越明显,但PMMA薄膜厚度均匀性受到一定影响。

The silicone rubber was used to emboss polymethyl methacrylate（PMMA） products instead of traditional lower mold. The constitutive model of silicone rubber and the material model of PMMA were determined as Mooney-Rivlin model and generalized Maxwell model,respectively,and the material parameters of silicone rubber with different hardness were determined by the uniaxial tensile test. The finite element simulation software ANSYS was used to simulate the molding process of PMMA products,and the effects of pressure load,embossing temperature and silicone rubber hardness on the PMMA products deformation were investigated. The results showed that,with the increase of pressure and embossing temperature,the depth of microchannel was increased. The smaller the hardness of silicone rubber was,the better the PMMA molding effect was,but the thickness uniformity of PMMA film was affected.