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为解决传统同心环式Fresnel透镜及其模具金刚石刀具加工存在对加工系统要求过高及效率较低的问题,给出了Archimedes螺线式Fresnel透镜的设计方法。从几何聚光比和能流透射率方面对比了2种透镜的性能,发现两者性能基本一致。分析了大型Fresnel透镜及其模具金刚石车削机床的运动。计算了Archimedes螺线式Fresnel透镜车削加工的刀具轨迹。对比机床各轴精度对透镜光学性能的影响,发现刀具摆角、透镜法线方向进给轴的精度影响最大,采用附加沿刀具轴线方向微进给装置的机床结构能有效提高加工精度。
In order to solve the problem that the conventional concentric ring Fresnel lens and its mold diamond tool have the problems of over-processing and low efficiency to the processing system, the design method of Archimedes spiral Fresnel lens is given. The performance of the two kinds of lenses is contrasted with the geometric and energy flow transmissivity, and the performance of the two lenses is basically the same. Analysis of large Fresnel lens and its mold diamond turning machine movement. The toolpath of the Archimedes spiral Fresnel lens was calculated. Contrasting the influence of each axis precision on the optical performance of the lens, it is found that the angle of the tool swing angle and the axis of the lens in the normal direction have the greatest impact on the accuracy of the feed axis. Adopting the micro-feed mechanism along the axial direction of the tool can effectively improve the machining accuracy.