金属粉末激光烧结过程中搭接率敏感性分析

Sensitivity analysis of overlap rate during DMLS processes

依据金属粉末直接激光烧结(DMLS)的实际烧结过程,以304不锈钢粉作为烧结材料,利用Ansys有限元软件,对其烧结成形温度场进行了数值模拟。首先对多道烧结过程中温度场的变化规律进行了分析,进而分析不同搭接率对温度场的影响,得出搭接率对烧结效果的敏感性。结果表明:搭接率过低会导致相邻烧结道之间存在未烧结粉末区域;搭接率过高又会造成温度过量集中,热量积累严重。针对所研究的304不锈钢粉,搭接率在26%~33%之间时,烧结效果较好。

According to the actual sintering process of direct metal laser sintering（DMLS）,304 stainless steel powder was used as sintering material,and the temperature field of sintering process was simulated by using Ansys finite element software. Firstly,the change of temperature field in multi pass sintering process was analyzed,and then the influence of different overlap ratio on the temperature field was analyzed. Results show that too low overlap ratio leads to non sintered area between the adjacent sintering channels,while too high overlap ratio causes excessively concentrated temperature and serious heat accumulation. The sintering effect of 304 stainless steel powder is better when the lap ratio is between 26%-33%.