This study aims to analyze the effect of the different common post-processes on the geometrical and dimensional accuracy of selective laser melting (SLM) parts.,An artefact has been designed including cubic features formed by planar surfaces orientated according to the machine axes, covering all the X-Y area of the working space. The artefact has been analyzed both geometrically (flatness, parallelism) and dimensionally (sizes, distances) from coordinate measuring machine measurement results at three stages, namely, as-built, after sand-blasting and after stress-relieving heat treatment.,Results from the SLM machine used in this study lead to smaller parts than the nominal ones. This effect depends on the direction of the evaluated dimension of the parts, i.e. X, Y or Z direction and is differently affected by the sandblasting post-process (average erosion ratio of 68, 54 and 9 µm, respectively), being practically unaltered by the HT applied after.,This paper shows the influence, from a geometric and dimensional point of view, of two of the most common post-processes used after producing SLM parts, such as sand-blasting and stress-relieving heat treatment, that have not been considered in previous research.

中文翻译：

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后处理对选区激光熔化零件几何精度和尺寸精度的影响分析

本研究旨在分析不同常见后处理对选择性激光熔化 (SLM) 零件的几何和尺寸精度的影响。, 设计了一个人工制品，包括由根据机器轴定向的平面表面形成的立方特征，覆盖工作空间的所有 XY 区域。从三坐标测量机测量结果的几何（平面度、平行度）和尺寸（尺寸、距离）分析了该工件在三个阶段，即竣工、喷砂后和去应力热处理后。,结果来自本研究中使用的 SLM 机器产生的零件比标称零件小。这种影响取决于零件评估尺寸的方向，即 X，