Study On The Forming Process Of Cobalt-Chromium Alloy Porcelain Fused To Metal Crown In SLM

Selective Laser Melting(SLM)is one of the most promising technologies in the field of Additive Manufacturing(AM).The technology uses high power focused laser beams to melt tiny metal powders and to form metal parts with metallurgical effects.Therefore,they are widely used in the forming process of denture.The porcelain fused metal crown has certain requirements on the forming accuracy and roughness of quality control on the base crown,but the defects of the molding and the problems of post treatment process of SLM will seriously affect the forming accuracy of the base crown and the roughness.In this paper,the optimized SLM machining process and post treatment process and precision compensation method of SLM processing were proposed,based on the study of SLM manufacturing process and post treatment process of cobalt chromium alloy porcelain fused to metal crown.The research contents are as follows:(1)In view of the defects in SLM manufacturing process,the influencing factors of the precision of cobalt chromium alloy forming parts under different process parameters are investigated through the SLM basic experiments.(2)The influence of dimensional accuracy and roughness different process of cobalt chromium alloy molding parts under different process parameters after different post treatment processes are explored,and the effects of dimensional accuracy and roughness on forming different structures are studied.(3)On the basis of the above research,the cobalt chromium alloy base crown machining allowance are proposed for the forming precision and roughness.After further experiments on optimized SLM machining process and post treatment process,finally the complete process makes the cobalt chromium alloy porcelain base crown forming precision meet the requirement.In summary,this paper analyzes the traditional crown forming process.Through the experiments of the SLM molding process and post-processing process,the regularity of SLM cobalt chromium alloy ceramic crown was summarized.Finally,a complete process is proposed to make the forming precision and roughness of the cobalt chromium ceramic alloy base crown meet the requirements.