Influence of Structure on the Secondary Sintering Zone of SLS Sand Mold and Its Control Process
In this paper,a precision test piece containing many common structures is designed to explore the influence of structure on the forming accuracy of sand mold printed by SLS.Through printing and dimensional measurement,it is found that the secondary sintering of longitudinal elliptical structure and circular hole is more serious than that of other structures,and there are directional differences.Compared with the conventional scanning method,the low-density multi-pass scanning method improves the accuracy level of national standard drum parts from more than 6 to 5 at the total energy density of 0.1 J·mm·s-2,and the dimensional deviation of the rib plate is reduced to 0.072 mm.
laser 3D printingstructureforming accuracycasting sand moldsecondary sintering
国家科技期刊平台
NSTL
万方数据
