Research on roller size modeling of sand bed laying in 3DP process
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摘要: 为探究影响粉末粘结类3D打印工艺成型质量的因素，文章在砂型打印的砂床铺设阶段，基于固体力学进行辊子半径和铺砂质量之间的规律进行分析，得到铺砂质量随辊子半径的变化趋势，给出了砂床规模给定的情况下辊子半径大小的取值范围。采用离散元仿真软件建立了铺砂阶段的数值仿真模型，完成了不同尺寸辊子铺砂后砂床质量评价，通过仿真给出了铺设较高质量砂床的辊子半径取值范围，其结果与理论计算一致性较高，证实了理论分析的有效性。Abstract: In order to explore the factors affecting the forming quality of powder-bonded 3D printing process, this paper uses the sand bed laying stage of sand mold printing to analyze the law between the roll radius and the sand laying quality based on solid mechanics, and obtains the change of the sand laying quality with the roller radius trend. Through the derived formula, the value range of the roller radius under the specified sand bed scale is given. The discrete element simulation software EDEM is used to establish the numerical simulation model of the sand laying stage, and the quality measurement of the sand bed after sand laying with rollers of different sizes is completed on the constructed sand bed. The results are in good agreement with the calculation results of the proposed theoretical formula, and the validity of the theoretical formula is verified by simulation.
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Key words:
- 3DP technology /
- sand laying process /
- roller /
- DEM
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表 2 铺砂过程的工艺参数
参数 数值 辊子平移速度$ {v} $/(m/s) 0.1 辊子半径$ {{R}}_{{\rm{{r}{o}{l}{l}}}} $/mm 5 辊子旋转速度$ {\omega } $/(rad/s) 40 层厚$ h $/mm 0.3 供料箱长度$ {{l}}_{1} $/mm 20 供料箱的宽度$ W $/mm 20 高出供料箱砂层的厚度$ {{h}}_{1} $/mm 1 成型箱长度$ {{l}}_{2} $/mm 30 
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表 3 辊子半径与自转速度设置
组号 辊子半径$ {{R}}_{\mathrm{r}\mathrm{o}\mathrm{l}\mathrm{l}} $/mm 自转速度$ \mathrm{\omega } $/(rad/s) 1 2.50 80.00 2 4.00 50.00 3 5.00 40.00. 4 6.25 32.00 5 7.00 28.50 6 12.50 16.00 7 25.00 8.00 8 40.00 5.00 9 50.00 4.00 10 62.50 3.20 11 70.00 2.85 12 80.00 2.50
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表 4 不同辊子半径仿真数据
辊子半径
$ {{R}}_{\mathrm{r}\mathrm{o}\mathrm{l}\mathrm{l}} $/mm表层致密度/
(g/cm3)中间层致密度/
(g/cm3)平均致密度/
(g/cm3)2.50 0.864 1 2.090 0 1.477 1 4.00 0.875 0 2.087 9 1.481 5 5.00 0.944 2 2.065 5 1.504 9 6.25 1.008 1 2.094 8 1.551 5 7.00 1.025 0 2.091 4 1.558 2 12.50 1.107 0 2.101 7 1.604 4 25.00 1.174 4 2.140 4 1.657 4 40.00 1.267 6 2.169 4 1.718 5 50.00 1.291 4 2.162 5 1.727 0 62.50 1.362 5 2.174 8 1.768 7 70.00 1.364 9 2.124 0 1.744 5 80.00 1.365 4 2.177 0 1.771 2
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