l******t
发帖数: 55733 | 1 美国专家欲利用3D打印机在月球上制造机械部件(图)
新闻来源: 中国国防科技信息网 于December 25, 2012 15:43:55 敬请注意:新闻取自
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资料图：美国科研人员研究使用仿造的月球岩石制造可供3D打印机使用的材料，现场
打印月球工程需要的零件。
www.6park.com
据美国今日航天网2012年12月18日报道 华盛顿州立大学机械材料工程学院
Bandyopadhyay教授和同事最近在《快速成形》杂志上发表了一篇论文，验证了如何利
用来自月球的材料打印成部件。 www.6park.com
2010年，NASA研究人员开始与Bandyopadhyay讨论是否能利用月球岩石打印3D物体
。由于太空旅行极为昂贵，研究人员力图将飞船携带的载荷减至最少。建立月球或火星
前哨需要使用建造和维修材料，此时可以引入3D打印制造技术。 www.6park.com
3D制造技术也被称为增材制造，允许研究人员直接在计算机辅助设计（CAD）模型
下生产构型复杂的三维物体，一层层地打印物体。制造过程中，材料内激光加热到高温
，像融化的蜡烛那样打印成需要的形状。 www.6park.com
为试验这一想法，NASA研究人员向Bandyopadhyay等提供了10磅[换算]月球风化层
岩石仿制品。Bandyopadhyay等关注由硅、铝、钙、铁、镁氧化物组成的月球岩石原料
将如何熔化，并发现岩石熔化表现与二氧化硅类似。 研究人员希望未来月球材料能被
用于远程维修。此项研究得到了75万美元的资金支持。（中国航天系统科学与工程研究
院 侯丹 陈菲） | l******t
发帖数: 55733 | 2 不懂为什么这么多wsn认为3D打印机是骗小孩的玩意。 | t****v
发帖数: 9235 | | l******t
发帖数: 55733 | 4
金属打印。非专业看热闹
http://www.extremetech.com/extreme/140084-nasa-3d-prints-rocket
ASA’s Marshall Space Flight Center in Huntsville, Alabama, has 3D printed
nickel alloy rocket engine parts using a fabrication technique called
selective laser melting, or SLM. The part will be used on the J-2x engine
for the largest rocket ever built, known simply as the Space Launch System.
3D printing (see: What is 3D printing?) has become popular for fabricating
parts from plastic, but using the technique with metals requires equipment
that is a bit more extreme. Will 3D printing of hard materials become part
of a general, growing trend, or will these exotic fabrication technologies
be viable only for elite, niche markets?
SLM evolved from an older method known as selective laser sintering, or SLS.
In the traditional sintering process, a part is first molded from ceramic
or metal powder and pressed into the desired shape. The “green,” as it is
called at this point, is then fired in a oven to bond it. The oven was later
replaced with a laser which provides greater precision and eliminates the
need to handle the fragile, green part. Since full melting of the powder
would destroy the part in the process of fusing it, sintered parts are not
as strong as cast or machined parts, but they do retain intrinsically
desirable properties like resistance to corrosion and temperature.
It was later discovered that full melting of powdered metal particles could
be achieved by a technique called electron beam melting, or EBM. Since
electrons tend to scatter off of gas molecules, expensive and inconvenient
vacuum chambers are required for this process to work. As more affordable
laser systems with higher power, more accurate beamsteering, and better
focusing optics were developed, SLM was born. Like EBM, the powder material
is fully melted during fusion, but the SLM laser does not require vacuum to
function. It only requires that an inert argon or nitrogen atmosphere is
used in the work area to prevent oxidation.
。。。
【在 t****v 的大作中提到】
: 75万美元研究经费
| l*****i
发帖数: 20533 | 5 结果为了打印一个零件，需要用的燃料/设备等等平摊下来比直接多带一个备用小零件
要重多了。。。 |
|
