为优化非球面透镜模压成型过程中的工艺参数,利用MSC.Marc软件建立了二维轴对称模型。基于五单元广义Maxwell黏弹性模型对D-ZK3玻璃材料的模压成型过程进行有限元仿真,分析了玻璃预制体和模具等效应力的变化以及模压温度、模压速率、摩擦因数对等效应力的影响。结果表明,透镜边缘的等效应力大于透镜中心,上表面中心点的等效应力大于下表面中心点,透镜和模具的等效应力都随模压速率和摩擦因数的增大而增大、随模压温度的升高而减小,且模具的等效应力大于透镜。正交试验表明,模压温度和模压速率是影响玻璃预制体等效应力的主要因素,结合实际应用得到最合适的模压工艺参数是模压温度为580 ℃、模压速率为0.1 mm/s、摩擦因数为0.2。

In order to optimize the process parameters of aspherical lens molding process, a two-dimensional axisymmetric model is established by MSC.Marc software. Based on five-element generalized Maxwell viscoelastic model, a finite element simulation of the molding process of D-ZK3 glass materials is carried out. The changes in equivalent stress of glass preform and dies, and the influence of molding temperature, molding rate, and friction factor on the equivalent stress are analyzed. The results show that the equivalent stress at the edge of the lens is larger than that at the center of the lens, and the equivalent stress at the center point of the upper surface is greater than that at the center point of the lower surface. The equivalent stress of the lens and the die increases with the increase of molding rate and friction coefficient, and decreases with the increase of molding temperature. The equivalent stress of the die is larger than that of the lens. Orthogonal test shows that the molding temperature and molding rate are the main factors affecting the equivalent stress of the glass preform. Combined with practical application, the most suitable molding parameters are molding temperature of 580 ℃, molding rate of 0.1 mm/s, and friction factor of 0.2.