Regeneration Technology of Coated Sand for Selective Laser Sintering
With the rapid development of 3D printing technology, the requirement of coated sand for Selective Laser Sintering (SLS) is becoming higher in terms of performance and volume. As a molding material with higher performance requirement and much more expensive than common shell molding sand, the emissions of one-time used SLS coated sand could lead to not only environmental pollution but also waste of resources. In this paper, the regeneration processes of coated sand for SLS was studied to discover the best parameters for the regeneration technology. Subsequently, the regenerated sand was coated. The samples for tensile strength and bending strength testing were sintered using HRPS-VI SLS equipment. Afterwards, the original sand for SLS and the regenerated sand was analyzed and compared in terms of sand microstructure, tensile strength, bending strength and cauterant decrease are analyzed and compared between original SLS sand and generated sand. The primary results show that: The morphology of regenerated sand is approximately close to spherical; the tensile strength and bending strength of the samples sintered using SLS coated regenerated sand are almost the same of the original SLS coated sand.
KeywordsSelective laser sintering Old sand regeneration Tensile strength
This work was financially supported by the major project of Shandong Science and Technology (No. 2015ZDZX03004) and the project of Natural Science Foundation of Shandong Province (No. ZR2016EEM48). The collaboration of the Shandong Tailai Aluminum Foundry Tech. Co. Ltd. is also acknowledged.
- 3.Z.F. Xu, P. Liang, W. Yang et al., Effects of laser energy density on forming accuracy and tensile strength of selective laser sintering resin coated sands. China Foundry 11, 151–156 (2014)Google Scholar
- 7.Y. Kurokawa, H. Kambayashi, H. Ota et al., Reclamation mechanism of waste green sand adhered with oolitics. J. Jpn. Foundry Eng. Soc. 71, 468–474 (1999)Google Scholar
- 9.N. Guigo, A. Mija, L. Vincent et al., The influence of reclaim on properties of moulding sand with furan resin. Arch. Foundry Eng. 10, 61–64 (2010)Google Scholar
- 10.Q.Z. Sun, R.F. Xu, Z.K. Zhao et al., Reclamation of green sand containing hot-box resin sand and its application. Adv. Mater. Res. 21, 435–438 (2008)Google Scholar