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为实现微小零件高精度低成本快速制作,构建了新型面曝光快速成形试验系统。该系统由视图发生器、精密升降工作台及控制系统构成。利用视图发生器生成的零件截面图形作为动态掩模,对光敏树脂整层曝光固化,实现微小三维零件的制作。对视图平面紫外光强分布进行了研究,建立了光强分布关于被测点位置及视图灰度的关系模型,利用该模型,实现了视图平面紫外光强分布的均匀化,紫外光强的最大与最小值之差达到0.4μW/cm2。利用该快速成形系统,制作了具有复杂微小特征的三维零件。测试件的测量和分析结果表明,误差在±0.06 mm范围内尺寸数量占所有测量尺寸的72.2%。与扫描式光固化激光快速成形系统相比,该系统成本低,制作时间短。
In order to realize the high-precision and low-cost manufacture of small parts quickly, a new type of surface rapid prototyping test system was constructed. The system consists of view generator, precision lifting table and control system. Use the view generator generated cross-sectional graphics as a dynamic mask, the entire layer of light-sensitive resin exposure curing, the realization of tiny three-dimensional parts. The intensity distribution of the plane UV light is studied. The relation model between light intensity distribution and the gray level of the view point is established. By using this model, the uniformity of the UV light intensity distribution in the view plane is maximized, The difference from the minimum value is 0.4 μW / cm2. Using the rapid prototyping system, three-dimensional parts with complex and small features were fabricated. Measurement and analysis results of the test piece show that the size of the error within ± 0.06 mm occupies 72.2% of the total measured size. Compared with the scanning light curing laser rapid prototyping system, the system is low cost, short production time.