【摘要】 设计了一种包含多种常见结构的精度测试件，用于探究结构对SLS打印的砂型成形精度的影响。通过打印和尺寸测量发现，纵向椭圆结构和圆孔的次级烧结相对其他结构更加严重，且存在方向性差异。采用低密度多道次的扫描方法，相较于常规扫描方法，在0.1 J·mm·s^-2的总能量密度下可以将国标鼓形件的精度等级从无评级提高至5级，筋板的尺寸偏差降低到0.072 mm，显著改善了砂型的尺寸精度。更多还原

【Abstract】 In this paper, a precision test piece containing many common structures is designed to explore the influence of structure on the forming accuracy of sand mold printed by SLS. Through printing and dimensional measurement, it is found that the secondary sintering of longitudinal elliptical structure and circular hole is more serious than that of other structures, and there are directional differences. Compared with the conventional scanning method, the low-density multi-pass scanning method improves the accuracy level of national standard drum parts from more than 6 to 5 at the total energy density of 0.1 J·mm·s^-2, and the dimensional deviation of the rib plate is reduced to 0.072 mm.更多还原