选区激光熔化快速成型过程分析

分析了选区激光熔化的成型过程及成型机理,归纳了该工艺的技术特征,推导了温升与加工参数间的解析关系式,并据此优化了选区激光熔化快速成型的工艺.采用Cu-P合金对成型工艺进行了实验验证,分析了扫描速度及激光功率对成型质量的影响,探讨了球化的成因及消除方法.结果表明,通过合理配置扫描速度、扫描间距、激光功率等加工参数,可以直接成型具有高致密性的金属零件.

Process Analysis of Rapid Prototyping with Selective Laser Melting

The process and mechanism of a rapid prototyping method,namely,selective laser melting,were analyzed.The characteristics of this method were then summed up and a mathematical expression was deduced to describe the relationship between the temperature rise and the processing parameters.Moreover,the proposed expression was used to optimize the rapid prototyping process.Experiments were finally conducted to verify the prototyping process with Cu-P alloy as the material,by which the influences of the scanning speed and the laser power on the molding quality,the reasons for metal balling and the methods to avoid balling were discussed.The results indicate that,by reasonably adjusting the processing parameters,such as the scanning speed,the scanning space and the laser power,metal parts with high density can be directly fabricated.