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A New Additive Manufacturing File Format using Bezier Patches

机译：使用Bezier补丁的新添加剂制造文件格式

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Additive Manufacturing (AM) processes are used to fabricate parts with complex geometries in a layer by layer approach. Current AM machines use Stereolithography (STL) file format to manufacture parts. An STL file format is a discrete representation of a CAD model which uses planar triangular facets to tessellate the surface of part. Due to this planar tessellation, the STL format does not retain the complete geometric information of a CAD model which leads to approximation errors. The higher the curvature of a design surface, the larger is the approximation error of the STL file. In current CAD systems, the translation errors are minimized by using finer tessellations with smaller triangular facets which increases the size and memory of the STL file. Even with finer tessellations, it is not possible to exactly represent a CAD part with planar triangles. This paper presents a methodology for developing new alternate file formats using curved bi-quadratic Bezier patches which can approximate a CAD model with higher accuracy as compared to the STL file. Two new Bezier based formats are presented in this paper: the first format uses curved Bezier patches with linear edges and the second format uses curved Bezier patches with curved edges. In the first format named as the linear edge format, the patches are modeled such that the edges remain coincident with those of the original STL facets. In the second format called the curved edge format, the Bezier patch edges are modeled as quadratic Bezier curves. The new file formats have been developed for two test surfaces and the accuracies of the new formats have been compared to that of the existing STL format. Further validation of the file formats has been performed by comparing the profile errors of a test surface that has been virtually manufactured using the new Bezier formats and the STL format.
机译：添加剂制造（AM）方法用于通过层方法在层中用复杂几何形状制造部件。当前AM机器使用立体刻（STL）文件格式来制造零件。 STL文件格式是CAD模型的离散表示，该模型使用平面三角形刻面来镶嵌部分的表面。由于该平面曲面细分，STL格式不保留CAD模型的完整几何信息，导致近似误差。设计表面的曲率越高，STL文件的近似误差越大。在当前的CAD系统中，通过使用具有较小三角形面的更精细的曲面来最小化转换误差，这增加了STL文件的尺寸和存储器。即使具有更精细的曲面，也无法精确地表示具有平面三角形的CAD部分。本文介绍了一种使用曲线二次二次Bezier补丁开发新的替代文件格式的方法，该修补程序与STL文件相比，可以近似高精度的CAD模型。本文提出了两种新的Bezier基于格式：第一格式使用带有线性边缘的弯曲贝尔贴片，第二种格式使用具有弯曲边缘的弯曲贝尔贴片。在命名为线性边缘格式的第一格式中，修补程序被建模，使得边缘与原始STL平面的边缘保持一致。在称为曲线格式的第二格式中，Bezier补丁边缘被建模为二次Bezier曲线。已经为两个测试曲面开发了新的文件格式，并将新格式的准确性与现有的STL格式的精度进行了比较。通过使用新的Bezier格式和STL格式进行比较实际制造的测试表面的轮廓错误来执行对文件格式的进一步验证。

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