Abstract
Polystyrene/polyethylene (PS/PE) mixed powder was prepared by mechanical mixing in order to overcome the poor strength of the pure polystyrene (PS) selective laser sintering (SLS) molding parts. The optimum combination of process parameters was selected by orthogonal test and range analysis, and the effect of material ratio on bending strength and Z dimensional precision of PS/PE sintered parts was studied. The results show that the optimum process parameters are as follows: filling speed 1600mm·s−1, preheating temperature 85°C and scanning distance 0.30mm. The optimum ratio of PS/PE mixed powder is 9:1 under the combination of the process parameters. Under the combined process parameters, the bending strength of sintered parts can reach 8.91Mpa, and the absolute value of Z relative dimension deviation is only 0.65%. Compared with pure PS under the same conditions, it increased by 6.5% and 62.86 % respectively.
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