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Model of surface roughness and material removal using abrasive flow machining of selective laser melted channels
Rapid Prototyping Journal ( IF 3.9 ) Pub Date : 2020-07-06 , DOI: 10.1108/rpj-09-2019-0241
Julian Ferchow , Harry Baumgartner , Christoph Klahn , Mirko Meboldt

Internal channels produced by selective laser melting (SLM) have rough surfaces that require post-processing. The purpose of this paper is to develop an empirical model for predicting the material removal and surface roughness (SR) of SLM-manufactured channels owing to abrasive flow machining (AFM).,A rheological model was developed to simulate the viscosity and power-law index of an AFM medium. To simulate the pressure distribution and velocity in the SLM channels, the fluid behavior and SR in the channels were simulated by using computational fluid dynamics. The results of this simulation were then applied to create an empirical model that can be used to predict the SR and material removal thickness. To verify this empirical model, it was applied to an actual part fabricated by SLM. The results were compared with the measurements of the SR and channel diameter subsequent to AFM.,The proposed model exhibits maximum deviation between the model and the measurement of −1.1% for the down-skin SR, −0.2% for the up-skin SR and −0.1% for material removal thickness.,The results of this study show that the proposed model can avoid expensive iterative tests to determine whether a given channel design leads to the desired SR after smoothing by AFM. Therefore, this model helps to design an AFM-ready channel geometry.,In this paper, a quantitatively validated AFM model was proposed for complex SLM channels with varying orientation angles.

中文翻译:

使用选择性激光熔化通道的磨料流加工的表面粗糙度和材料去除模型

选择性激光熔化 (SLM) 产生的内部通道具有需要后处理的粗糙表面。本文的目的是开发一个经验模型来预测 SLM 制造通道的材料去除和表面粗糙度 (SR) 由于磨粒流加工 (AFM)。, 开发了一个流变模型来模拟粘度和幂律AFM 介质的索引。为了模拟 SLM 通道中的压力分布和速度,使用计算流体动力学模拟了通道中的流体行为和 SR。然后应用该模拟的结果来创建可用于预测 SR 和材料去除厚度的经验模型。为了验证这个经验模型,它被应用于由 SLM 制造的实际零件。将结果与 AFM 之后的 SR 和通道直径的测量值进行比较。, 所提出的模型显示出模型与测量值之间的最大偏差,下层 SR 为 -1.1%,上层 SR 为 -0.2%和 -0.1% 的材料去除厚度。这项研究的结果表明,所提出的模型可以避免昂贵的迭代测试,以确定给定的通道设计在 AFM 平滑后是否会导致所需的 SR。因此,该模型有助于设计 AFM-ready 通道几何结构。在本文中,针对具有不同取向角的复杂 SLM 通道提出了一种经过定量验证的 AFM 模型。1% 的材料去除厚度。这项研究的结果表明,所提出的模型可以避免昂贵的迭代测试,以确定给定的通道设计在 AFM 平滑后是否会导致所需的 SR。因此,该模型有助于设计 AFM-ready 通道几何结构。在本文中,针对具有不同取向角的复杂 SLM 通道提出了一种经过定量验证的 AFM 模型。1% 的材料去除厚度。这项研究的结果表明,所提出的模型可以避免昂贵的迭代测试,以确定给定的通道设计在 AFM 平滑后是否会导致所需的 SR。因此,该模型有助于设计 AFM-ready 通道几何结构。在本文中,针对具有不同取向角的复杂 SLM 通道提出了一种经过定量验证的 AFM 模型。
更新日期:2020-07-06
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