Research On Rapid Prototyping Forming Technology And Post-treatment Coating With Powder Selective Laser Sintering

The present situation and the problem in the rapid prototyping (RP) technology and in selective laser sintering (SLS) process are analyzed systematically and the polystyrene (PS) powder sintering technology parameter and the precision of prototypes of SLS are researched deeply and systematically in this thesis. Through series experiment, the optimization of SLS parameters, control method of prototypes accuracy are achieved, espically a tolerance compensation model for prototyping precision is derived. Through the research on sintering mechanism of SLS polystyrene powder,the tranferring process of laser energy in SLS are analyzed, and the temperature control tactics for PS powder SLS are put forward.As the requirement for the material in post-treatment of SLS prototypes, the serial experiments are carried out for the component material of the post-treatment, and the base resin, diluent, curing agent are optimized in this thesis. Combining the characteristics of post-treatment technology, the curing velocity and temperature are carried out experiment and analyzed, and the ideal curing model for post-treatment material are put forward. Through the modification and combination for curing agents, the required curing agents are obtained, and the two post-material HT1 and HT2 are developed.The making of wear-resitant coating with adding suitable amount of Al2O3 particle in post-treatment material is also researched in this thesis.