在激光烧结(LS)打印过程中,通过在粉末床上逐层烧结形成打印部件。因此,必须将激光烧结粉末床的尺寸精度作为重要的评价指标。在本文中,提出了一种非结晶热塑性聚合物材料的广义粉末床尺寸精度补偿模型。以聚醚砜(PES)材料为例,本研究对LS打印过程中影响粉末床尺寸精度的主要因素进行了建模和实验分析,包括四个重要因素:激光参考偏差,温度偏差,密度偏差,和二次烧结偏差。在这项研究中,CX_A200LS设备用于原型设计和验证,3D扫描方法用于测量打印部件,并对测量结果进行了数字化对比分析。在此基础上,通过实验确定了所提出的补偿模型中各个影响因素的关系,实验结果表明,所提出的补偿模型在校正粉末床尺寸精度偏差方面的有效性约为95%。
In the laser sintering (LS) printing process, a printed part is formed by sintering layer-by-layer on the powder bed. Thus, it is necessary to consider the dimensional accuracy of the laser-sintered powder bed as an important evaluation index. In this paper, a generalized powder bed-size accuracy compensation model is proposed for non-crystalline thermoplastic polymer materials. Taking polyethersulfone (PES) material as an example, the main factors influencing powder bed dimensional accuracy during LS printing are modeled and analyzed experimentally in this study, including four important factors: laser reference deviation, temperature deviation, density deviation, and secondary sintering deviation. In this study, CX_A200 LS equipment is used for prototyping and verification, a 3D scanning method is used to measure the printed parts, and the measurement results are digitally compared and analyzed. On this basis, the relationship of each influencing factor in the proposed compensation model is determined experimentally, and the experimental results demonstrate that the proposed compensation model is approximately 95% effective in terms of correcting the deviation of powder bed dimensional accuracy.