Beltrán Natalia, Álvarez Braulio J, Blanco David, Peña Fernando, Fernández Pedro
IPF Research/ARAMO Group, University of Oviedo, 33203 Gijón, Spain.
Polymers (Basel). 2021 Apr 2;13(7):1132. doi: 10.3390/polym13071132.
The dimensional and geometrical quality of additively manufactured parts must be increased to match industrial requirements before they can be incorporated to mass production. Such an objective has a great relevance in the case of features of linear size that are affected by dimensional or geometrical tolerances. This work proposes a design for additive manufacturing strategy that uses the re-parameterization of part design to minimize shape deviations from cylindrical geometries. An analysis of shape deviations in the frequency domain is used to define a re-parameterization strategy, imposing a bi-univocal correspondence between verification parameters and design parameters. Then, the significance of variations in the process and design factors upon part quality is analyzed using design of experiments to determine the appropriate extension for modelling form deviation. Finally, local deviations are mapped for design parameters, and a new part design including local compensations is obtained. This strategy has been evaluated upon glossy surfaces manufactured in a Vero™ material by polymer jetting. The results of the proposed example showed a relevant improvement in dimensional quality, as well as a reduction of geometrical deviations, outperforming the results obtained with a conventional scaling compensation.
在增材制造零件能够纳入大规模生产之前，必须提高其尺寸和几何质量以满足工业要求。对于受尺寸或几何公差影响的线性尺寸特征而言，这一目标具有重大意义。本文提出了一种增材制造策略设计，该策略利用零件设计的重新参数化来最小化与圆柱几何形状的形状偏差。通过在频域中对形状偏差进行分析来定义重新参数化策略，在验证参数和设计参数之间建立双单值对应关系。然后，利用实验设计分析工艺和设计因素的变化对零件质量的影响，以确定用于建模形状偏差的合适范围。最后，针对设计参数绘制局部偏差图，并获得包含局部补偿的新零件设计。该策略已在通过聚合物喷射工艺用Vero™材料制造的光滑表面上进行了评估。所举示例的结果表明，尺寸质量有显著提高，几何偏差也有所减少，优于采用传统缩放补偿所获得的结果。
