这Fraunhofer Institute for Laser Technology ILTbased in Aachen, Germany, has developed a new laser powder bed fusion (LPBF) based 3D printing method that reduces a component’sresidual stresses and distortion。
在概念测试证明中，弗劳恩霍夫（Fraunhofer Ilt）科学家的3D印刷了由Superaly Inconel 718据报道，“这表明失真大大减少”。在此测试中，将组件加热到500°C的温度，均为热源多于下面。
LPBF和金属3D打印的未来
弗劳恩霍夫ILT是弗劳恩霍夫协会的一部分69 applied science research institutes across Germany. Together with theFraunhofer应用光学和精密工程研究所IOFit has formed theFraunhofer Cluster of Excellence旨在提高社会在激光技术方面的国际领导。截至2017年11月，ILT与Fraunhofer家族的其他5个机构一起一直领导Future Additive Manufacturing(FutureAM) project to accelerate the development and reduce the cost of metal 3D printing processes.
该研究所在LPBF中的最新努力，将于2018年Formnext展示，Fraunhofer ILT正在与红外激光专家合作Philips Photonicson a government-funded Digital Photonic Production DPP research initiative title DPP Nano.
减少残余应力
通过DPP Nano项目，Fraunhofer科学家在LPBF系统的构建室内建立了新的热量平衡。
This 3D printing system relies on heating the print bed from below. However, such methods are a cause in the creation of internal thermal stresses throughout a 3D printed part, which in turn can lead to defects.
除床外，DPP纳米项目系统还在工艺室的顶部还有一个热源 - 六个垂直腔体发射激光杆（VCSEL）。
400年独立激活,每个VCSEL栏发出W of power and provides 808 nm infrared radiation. With the bars, components can be heated up to several hundred degrees Celsius, with monitoring via infrared camera.
“The VCSEL heating reduces the thermal gradient, thus also the stresses, making it possible to produce taller parts,” explains the institute. Following the Inconel 718 test, scientists are now looking to tune the process to work with crack-prone钛校友。
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A great deal of research has been applied to an understanding melted powder behavior and the subsequent improvements of the powder bed fusion process.
在Lawrence Livermore National Laboratory(LLNL)Ibo Mathewsand his team have been leading studies into the “飞溅效果” of metal powders inside the print bed. By applying high speed imaging and algorithmic analysis to this behavior, LLNL teams are also one step closer to固定组件“即时”as they are 3D printed. Similarly, Argonne National Laboratory scientists are applying infrared imaging alongside synchrotronic x-rays of the powder bed to increase the abilitydetect flaws in 3D printed parts。
Fraunhofer ILT的VCSEL供暖过程是以更可靠的方式管理LPBF流程的一种解决方案。该过程的进一步详细信息将由Fraunhofer ILT团队在Booth E70的Formnext上介绍，从13日至2018年11月16日。
Last year, the institute presented its large-formatSLM实验室系统at the show, along with samples from the2018 3D Printing Industry Awards- 主导TwoCure 3D printingprocess. Details of the 2019 3D Printing Awards are coming soon.
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特色图片显示“最多可2.5 kW，工作平面可独立于整体高度进行预热。”通过Volker Lannert/Fraunhofer Ilt的照片和标题
