Laser based micro forming and assembly.

MacCallum, Danny O' ; Neill ; Wong, Chung-Nin Channy ; Knorovsky, Gerald Albert ; Steyskal, Michele D. ; Lehecka, Tom ; Scherzinger, William Mark ; Palmer, Jeremy Andrew

Sandia National Laboratories

关键词: High Energy Forming.;    Thermal Stresses;    36 Materials Science;    Thin Films;    Finite Element Method Material Science And Metallurgy-Working, Forming, Machining &;   

DOI  :  10.2172/899077
RP-ID  :  SAND2006-7239
RP-ID  :  AC04-94AL85000
RP-ID  :  899077

美国|英语

来源: UNT Digital Library

【 摘 要 】

It has been shown that thermal energy imparted to a metallic substrate by laser heating induces a transient temperature gradient through the thickness of the sample. In favorable conditions of laser fluence and absorptivity, the resulting inhomogeneous thermal strain leads to a measurable permanent deflection. This project established parameters for laser micro forming of thin materials that are relevant to MESA generation weapon system components and confirmed methods for producing micrometer displacements with repeatable bend direction and magnitude. Precise micro forming vectors were realized through computational finite element analysis (FEA) of laser-induced transient heating that indicated the optimal combination of laser heat input relative to the material being heated and its thermal mass. Precise laser micro forming was demonstrated in two practical manufacturing operations of importance to the DOE complex: micrometer gap adjustments of precious metal alloy contacts and forming of meso scale cones.