为实现小口径双非球面硫系玻璃镜片的精密模压成型制造, 通过正交模压成型实验, 研究了相关工艺参数对成型镜片质量的影响规律。首先, 介绍了模压成型过程和用于实验的PFLF7-60A型多工位模压成型机床, 并根据非球面曲线公式设计了目标镜片。然后, 选定了一种环保型硫系玻璃IRG205, 通过VFT方程拟合了玻璃粘度与温度之间的关系, 确定了模压温度, 并对各工位实验参数进行了设置。最后, 利用无镀膜模具及球形预形体进行了正交模压成型实验, 分析了实验条件下模压温度、加压载荷及保持压力等成型工艺参数对镜片成型质量(形状精度PV、表面粗糙度Ra及轮廓偏移量)的影响规律, 并获得了优化的成型工艺参数。结果显示: 在优化的工艺参数下, 成型镜片ASP1和ASP2的PV值分别为129.2 nm和174.8 nm, Ra值分别为19.6 nm和25.6 nm, 轮廓偏移量分别为0.614 μm和2.682 μm, 基本满足镜片高精度应用的要求, 为小口径双非球面硫系玻璃镜片的高精度批量制造提供了参考和依据。

In order to realize the precision molding of small dual aspherical chalcogenide glass lenses, the influence of the relevant process parameters on the quality of molded lenses was studied by orthogonal molding experiment. Firstly, the molding process and the PFLF7-60A multi-station molding machine were introduced, the target lens was designed according to the aspheric curve formula. Secondly, an environmentally friendly chalcogenide glass IRG205 was selected, and the relationship between the viscosity and temperature of the glass was fitted by the VFT equation, then the molding temperature was determined, and the experimental parameters of each station were also established. Finally, the orthogonal molding experiments were conducted with no-coated mold and spherical preform, the regular influence of molding process parameters such as molding temperature, pressing load and maintenance force on the lenses′ molding quality(form accuracy PV, surface roughness Ra and profile deviation) were analyzed, and the optimized molding process parameters were obtained. The results have demonstrated that the values of PV for ASP1 and ASP2 are 129.2 nm and 174.8 nm, the values of Ra are 19.6 nm and 25.6 nm, and the values of profile deviation are 0.614 μm and 2.682 μm, respectively. The results can satisfy the requirements for high-precision applications of lenses, and provide reference and basis for the high-precision mass production of small dual aspheric chalcogenide glass lenses.