金属3D打印后处理用多功能复合腔体的设计

Design of multi-functional composite cavity for metal 3D printing post-processing

金属3D打印是增材制造技术中最有潜力的加工方法,但成型产品存在孔隙率高、强度硬度低等问题。为了通过后处理工序提高制件的综合性能,设计一套集"加热、加压、表面喷砂"等功能于一体的多功能复合腔体,并对内筒体在20°C和400°C的两种条件下进行受力分析,通过经验公式计算和有限元分析表明,两种条件下等效应力均为58.09MPa,且小于对应温度下筒体材料的许用应力,在弹性范围内筒体的等效应变随着温度的升高而增加,多功能复合腔体工作顺序调整的临界温度为400°C。

The metal 3 D printing is the most promising processing method in additive manufacturing tech-nology, but formed products have problems such as high porosity and low strength ＆ hardness. In order to improve the overall performance of the workpiece through the post-treatment process, a multi-functional composite cavity integrating functions of ＂heating, pressing, surface blasting＂ has been designed. The forcing analysis has been conducted to the inner cylinder at 20℃ and 400℃ two conditions. The empirical formula calculation and finite element analysis show that the equivalent stress is 58.09 MPa under both conditions,which is less than the allowable stress of the cylinder body material at the corresponding temperature. The equivalent strain of the cylinder body increases with the increase of temperature, and the critical temperature of working order adjustment for the multi-functional composite cavity is 400℃.