选区激光熔化拼接复合成型基础工艺研究

Study on Splicing Composite Forming Foundation Process of Selective Laser Melting

针对数字化医学中个性化种植体基台的设计要求,提出了将数控加工和增材制造技术相结合,拼接制造个性化种植体基台的方法。根据拼接成型的特点,对传统选区激光熔化(Selective Laser Melting,SLM)成型基板进行改造,重新确定基体、SLM基板和成型零件之间的空间关系。通过工艺参数实验,成型表面的裂纹、粉末的球化以及剖面的裂纹孔隙等现象明显减少。利用优化的工艺参数对拼接区域的维氏硬度、拼接零件的拉伸性能进行研究。SLM拼接区域自成型顶面向下维氏硬度逐渐降低;拼接件的极限拉伸强度和伸长率要优于完全SLM制造的试件,试件经过热处理塑性得到了较大提高。

In order to satisfy design requirements of personalized implants abutment in digital medicine, a method to splicing manufacture implants abutment which combines high-precision CNC with flexible additive-manufacturing is proposed. Accord- ing to specialty in splicing forming, conventional substrate in Selective Laser Melting （SLM） has been improved by redefining spatial relationship between the matrix, SLM substrate, and molding parts. Cracks on the surface of molding parts, powder balling, cracks and holes in the section reduced obviously by process parameters optimization. Researches on Vickers hardness and tensile property of splicing region manufactured by optimized parameter show that Viekers hardness of SLM splicing region gradually reduces from top to bottom. Ultimate tensile strength and elongation of splicing parts are better than which manufac tured by SLM completely and parts＇ elongation improve obvious after heat treatment.