激光选区熔化/干式铣削复合加工实验研究

Experimental study on selective laser melting and dry milling hybrid process

为研究激光选区熔化增材与干式铣削减材复合加工中的工艺交互作用对零件成形质量的影响,以316L奥氏体不锈钢粉末为研究对象,分别采用单一增材工艺和“增材-减材”交替复合加工工艺制备试样,分析成形区的致密度、残余应力。实验结果表明,在制件致密度和残余应力方面,以上两种加工方法均受到激光能量密度的影响且规律相似。此外,复合加工中的铣削减材工艺会对成形样件的致密度和残余应力造成影响,在激光能量密度设置为100 J·mm^(-3)和125 J·mm^(-3)时,铣削减材工艺可以明显提高致密度并降低残余应力水平。

In order to study the effect of process interaction between selective laser melting and dry milling hybrid manufacturing on forming quality,316L austenitic stainless steel powder is used as the object of study,and specimens are prepared using a single additive process and"additive-subtractive"hybrid process to analyze the density and residual stresses in the formed area.The experimental results show that both processing methods are affected by laser energy density with similar patterns in terms of relative density and residual stress.Moreover,the milling process in hybrid manufacturing affects the density and residual stresses of the samples,and at laser energy density of 100 J·mm^(-3)or 125 J·mm^(-3),the milling process can significantly increase the density and reduce the residual stress level.