ABSTRACT

In this paper, an automatic determination method of part build orientation for laser powder bed fusion is presented. This method includes two steps. First, an existing facet clustering-based approach is applied to automatically generate the alternative orientations of a laser powder bed fusion part. Second, support volume, volumetric error, surface roughness, build time and build cost are considered. Their values in each alternative orientation are estimated by certain estimation models. The weights of these factors are determined via pairwise comparison. The weighted sum model is used to calculate a summary value of the factors in each alternative orientation. According to the calculated summary values, an optimal orientation to build the part is generated. To demonstrate the method, a set of part orientation cases are tested, and effectiveness analysis and efficiency and characteristic comparisons are reported. The demonstration results suggest that the proposed method can work for both regular and freeform surface models, produce stable and reasonable results and provide desired efficiency.

摘要

提出了一种自动确定激光粉末床熔合零件成形方向的方法。此方法包括两个步骤。首先，将现有的基于小面聚类的方法应用于自动生成激光粉末床融合部件的替代方向。其次，要考虑支撑体积，体积误差，表面粗糙度，制造时间和制造成本。它们在每个替代方向上的值由某些估算模型估算。这些因素的权重通过成对比较确定。加权和模型用于计算每个替代方向中因素的汇总值。根据计算出的汇总值，生成构建零件的最佳方向。为了演示该方法，测试了一组零件定向情况，并报告了有效性分析，效率和特性比较。演示结果表明，该方法可同时适用于规则曲面模型和自由曲面模型，产生稳定合理的结果并提供所需的效率。