XIE Xiaochang, LI Neng, SUN Bingbing, et al. Study on fabrication of submillimeter metal lattice microstructures by additive manufacturing combined with investment casting[J]. 2021,51(3):8-13. DOI： 10.7512/j.issn.1001-2303.2021.03.02.
Stereolithograph apparatus（SLA）,as one of the additive manufacturing technologies,was combined with the investment casting to produce metal lattices with sub-millimeter diameter trusses. The process optimization results show that the best parameter is 4.52 s of the single layer forming time with a single layer thickness of 50 μm. The stereolithography is used to create a sacrificial scaffold that is embedded in the invest-ment matrix with subsequent sublimation to create a system of 750 μm pores that are filled with ZAMAK3 alloy during casting.The metal lattices are created with two alternative approachesspin casting and gravity casting（with vacuum assist）. Compression testing of lattice structures demonstrates that two casting technologies produce metal lattices with comparable mechanical strengths,and the bearing pressure load is 1.24 k N and 1.30 k N respectively. The simulation results of finite element analysis are closer to those of centrifugal casting,when the deformation is more than 0.6 mm,the simulation results of finite element begin to deviate from the actual deformation.
metal lattice structuresadditive manufacturingstereolithographyinvestment castingmicromanufacturing