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On the effect of irradiance on dimensional accuracy in multijet fusion additive manufacturing
Rapid Prototyping Journal ( IF 3.9 ) Pub Date : 2021-06-16 , DOI: 10.1108/rpj-07-2020-0180
Mattia Mele , Giampaolo Campana , Gian Luca Monti

Purpose

The amount of radiated energy is known to be a crucial parameter in powder-bed additive manufacturing (AM) processes. The role of irradiance in the multijet fusion (MJF) process has not been addressed by any previous research, despite the key role of this process in the AM industry. The aim of this paper is to explore the relationship between irradiance and dimensional accuracy in MJF.

Design/methodology/approach

An experimental activity was carried out to map the relationship between irradiance and dimensional accuracy in the MJF transformation of polyamide 12. Two specimens were used to measure the dimensional accuracy on medium and small sizes. The experiment was run using six different levels of irradiance. For each, the crystallinity degree and part density were measured.

Findings

Irradiance was found to be directly proportional to part density and inversely proportional to crystallinity degree. Higher irradiance leads to an increase in the measured dimensions of parts. This highlights a predominant role of the crystallisation degree and uncontrolled peripherical sintering, in line with the previous literature on other powder-bed AM processes. The results demonstrate that different trends can be observed according to the range of sizes.



中文翻译:

辐照度对多喷射聚变增材制造中尺寸精度的影响

目的

众所周知,辐射能量是粉末床增材制造 (AM) 工艺中的一个关键参数。辐照度在多喷射聚变 (MJF) 过程中的作用尚未得到任何先前研究的解决,尽管该过程在 AM 行业中发挥着关键作用。本文的目的是探讨 MJF 中辐照度与尺寸精度之间的关系。

设计/方法/方法

进行了一项实验活动,以绘制聚酰胺 12 的 MJF 转化过程中辐照度与尺寸精度之间的关系。使用两个样品测量中、小尺寸的尺寸精度。该实验使用六种不同的辐照度水平进行。对于每个,测量结晶度和部件密度。

发现

发现辐照度与部件密度成正比,与结晶度成反比。更高的辐照度会导致零件的测量尺寸增加。这突出了结晶度和不受控制的外围烧结的主要作用,这与之前关于其他粉末床 AM 工艺的文献一致。结果表明,根据尺寸范围可以观察到不同的趋势。

更新日期:2021-07-15
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