In this paper, the method of “line to layer to part” was adopted to establish the theoretical models of the circle structures with different scanning strategies in selective laser melting. The prediction of the geometric accuracy of the circle structure was performed by using these models. Under the 90° rotate scanning strategy, the surface morphology of the circle structure represents as a series of steps with different sizes and the homogeneity of the dimension distribution is poor. Under the 67° rotate scanning strategy, although the circle structure has a nearly uniform dimension distribution, the surface morphology is still uneven and there are some punctate protuberances on the inter-layer. Under the “skin-core” scanning strategies with 90° and 67° rotate “core” scanning, the surface morphologies and the dimensions of the circle structures are almost the same. The surface morphology represents as a series of unconspicuous uniform steps and the homogeneity of the dimension distribution is good. Then, the experiments of SLMed Ti6Al4V circle structures were carried out to verify the theoretical models. The results show that the prediction and experimental results had a good correspondence, and the mismatch between them was less than 20 μm. These results provide a guideline for improving the accuracy of SLM technology.

本文采用“线到层到零件”的方法，建立了选择性激光熔化中不同扫描策略的圆形结构的理论模型。通过使用这些模型，可以预测圆形结构的几何精度。在90°旋转扫描策略下，圆形结构的表面形态表现为一系列大小不同的台阶，尺寸分布的均匀性较差。在67°旋转扫描策略下，尽管圆形结构具有几乎均匀的尺寸分布，但表面形态仍然不均匀，并且在中间层上有一些点状突起。在“皮芯”扫描策略下，分别以90°和67°旋转“皮芯”扫描，圆形结构的表面形态和尺寸几乎相同。表面形态表示为一系列不明显的均匀台阶，并且尺寸分布的均匀性良好。然后，进行了SLMed Ti6Al4V圆形结构的实验，以验证理论模型。结果表明，预测结果与实验结果吻合较好，两者的失配小于20μm。这些结果为提高SLM技术的准确性提供了指导。结果表明，预测结果与实验结果吻合较好，两者的失配小于20μm。这些结果为提高SLM技术的准确性提供了指导。结果表明，预测结果与实验结果吻合较好，两者的失配小于20μm。这些结果为提高SLM技术的准确性提供了指导。