Curved Layer Slicing for Improving Accuracy in Rapid Prototyping
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摘要: 传统成型方式只使用平面层造成零件表面精度不高，针对这一问题研究了曲面混合分层切片，并提出了一种检测成型整体精度的方法。自动检测模型中可以曲面打印的部分，使用更加精准的邻域法向均值算法计算偏移曲面，并对原始模型进行处理生成平面基底;针对实际中较为复杂模型，编写了碰撞检测和成型顺序规划算法，可根据实际成型设备的情况生成无碰撞的刀具路径。最后，实测打印多个零件对比，证明曲面打印能够大幅提升表面质量，拥有更低的表面粗糙度和更高的整体精度。Abstract: The traditional forming method uses the plane layer only, which cause the low surface accuracy of the parts, aiming at this problem, a novel curved mix-layer slicing method is studied, and a method to detect the overall accuracy of model is proposed. For a model for automatically detection printable surface for curved printing, and the more accurate neighbor-normal mean algorithm is used to calculate the offset surface and generate the plane base layer according to the original model. A collision detection and forming sequence planning process are also included for the complex model, which can generate collision free tool path according to the actual situation of forming equipment. Finally, the comparison results of multiple parts show that curved slicing can greatly improve the surface quality with lower surface roughness and higher overall accuracy.
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Key words:
- rapid prototyping /
- curved-layer slicing /
- printing accuracy
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表 1 成型表面质量对比
打印模式 Ra/μm Rz/μm Rsm/μm 2°平面打印 129.3 230.3 5.31 2°曲面打印 42.4 57.8 0.89 4°平面打印 118.1 217.0 2.90 4°曲面打印 37.5 53.8 0.74 6°平面打印 113.4 214.3 1.87 6°曲面打印 44.8 59.6 0.83 8°平面打印 88.6 192.8 1.34 8°曲面打印 60.6 72.8 0.82 10°平面打印 96.4 173.1 1.17 10°曲面打印 43.6 57.2 0.85 
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表 2 模型偏差对比
mm 模型 打印模式 平均偏差 标准偏差 离散值 飞机 曲面 0.0035 0.0541 0.0029 平面 0.0888 0.0677 0.0046 波浪面 曲面 0.0017 0.0704 0.005 平面 0.0985 0.0819 0.0086 扇叶 曲面 −0.006 0.0588 0.0062 平面 0.0936 0.0926 0.086 海龟 曲面 0.0069 0.0807 0.012 平面 0.1035 0.1043 0.071
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