Progress on high-performance rapid prototype aluminum mirrors
Progress on high-performance rapid prototype aluminum mirrors
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高性能快速原型铝镜研究进展
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
B. Myrick
中科院分区：
文献类型：
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作者：
K. Woodard;B. Myrick
近净形零件可以使用一些非常古老的工艺（熔模铸造）和相对较新的直接金属激光烧结（DMLS）工艺生产。这些工艺对于复杂的坯件轻量化和成本具有显著的优势，但并不固有地适合于生产高性能反射镜。DMLS工艺可以提供极其复杂的轻质结构，但是材料中留下的高残余应力导致不稳定的镜像保持。虽然没有DMLS的极端复杂性，但熔模铸造也可以以比DMLS甚至传统锻造镜坯低得多的成本提供复杂的轻质结构，但铸造（以及DMLS）的小于100%的密度限制了精加工质量。本文将介绍DMLS和熔模铸造工艺为高性能铝镜提供可行的近终形毛坯选择所取得的进展。完成和数字的结果将显示与现有的传统工艺相当的性能。
Near net shape parts can be produced using some very old processes (investment casting) and the relatively new direct metal laser sintering (DMLS) process. These processes have significant advantages for complex blank lightweighting and costs but are not inherently suited for producing high performance mirrors. The DMLS process can provide extremely complex lightweight structures but the high residual stresses left in the material results in unstable mirror figure retention. Although not to the extreme intricacy of DMLS, investment casting can also provide complex lightweight structures at considerably lower costs than DMLS and even conventional wrought mirror blanks but the less than 100% density for casting (and also DMLS) limits finishing quality. This paper will cover the progress that has been made to make both the DMLS and investment casting processes into viable near net shape blank options for high performance aluminum mirrors. Finish and figure results will be presented to show performance commensurate with existing conventional processes.