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摘要: 针对面曝光模式的数字光处理(Digital light processing, DLP)型3D打印机成型幅面较小问题, 提出一种移动拼接与错位均摊消除接缝痕迹相结合的大幅面技术方案. 该方案首先对三维模型进行均匀切片形成N层切面, 再对切面位图进行错位切分, 使得相邻层的拼接位置错开, 每张切面位图形成M张单元位图, 构成3D打印的数据源; 其次根据错位参数沿着X轴移动投影仪到达对应曝光位, 每层成型M张单元位图, 拼接构成一层切面薄片, 切面薄片的拼接位置逐层错开, 叠加生成三维模型实体. 实际打印结果表明, 该方案能够以较小的附加成本扩大成型尺寸, 提高模型整体质量.Abstract: In order to solve the problem that the forming area of digital light processing (DLP) type 3D printer with surface exposure mode is limited and small, a technical scheme combining mobile splicing and dislocation equalization to eliminate seam marks is proposed. Firstly, the three-dimensional model is sliced evenly to form N-layer slices, then the slices are divided by a staggered method, which makes the splicing positions of adjacent layers staggered. Each slice is divided into M sliced bitmaps, which constitute the data source of 3D printing. Secondly, according to the parameters, the projector is moved along the X-axis to reach the corresponding exposure position. Each layer solidifies M bitmaps and splices them together to form a layer of slices. The splicing positions of slices are staggered layer by layer, and three-dimensional model entities are generated by superposition. The actual printing results show that the scheme can enlarge the forming size and improve the quality of the model with a small additional cost.
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Key words:
- Digital light processing (DLP) /
- 3D printing /
- large-scale /
- staggered splicing /
- seam elimination
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图 9 几种拼接方法打印成品对比
Fig. 9 Comparison of finished products printed by several splicing methods
表 1 拉力破坏实验结果
Table 1 Results of destructive tensile tests
方案 模型 单层固化时间 后固化时间 次数 平均拉力 a 哑铃模型 1.5 s 2 h 8 280.7 N b 1.5 s 2 h 8 215.3 N d 1.5 s 2 h 8 273.9 N 
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表 2 打印成品结果比较表
Table 2 Comparison of printing results
模型 小狼头 
涡轮 
文字浮雕 
三角形数量 2282 307732 827148 方案 a b c d a b c d a b c d 尺寸 ${{{\boldsymbol{V}}_1}} $ $2{{{\boldsymbol{V}}_1}} $ $2{{{\boldsymbol{V}}_1}} $ $2{{{\boldsymbol{V}}_1}} $ ${{{\boldsymbol{V}}_2}} $ $2{{{\boldsymbol{V}}_2}} $ $2{{{\boldsymbol{V}}_2}} $ $2{{{\boldsymbol{V}}_2}} $ ${{{\boldsymbol{V}}_3}} $ $2{{{\boldsymbol{V}}_3}} $ $2{{{\boldsymbol{V}}_3}} $ $2{{{\boldsymbol{V}}_3}} $ 切片层数 190 380 380 380 208 417 417 417 30 60 60 60 切片时间 (min) 0.1 0.4 3.1 0.6 0.2 0.6 4.1 0.9 0.1 0.2 0.8 0.2 打印时间 (min) 18 54 57 58 21 59 64 66 3 9 11 11 总时间 (min) 18.1 54.4 60.1 58.6 21.2 59.6 68.1 66.9 3.1 9.2 11.8 11.2
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