脉冲激光选区熔化成形薄壁件研究

Research on F orming of Thin-walled Parts Using Pulsed Laser Selective Melting

为提高选区激光熔化(SLM)直接成形薄壁件的能力,讨论了脉冲时间,激光功率,扫描速度等成形工艺参数对单熔道的影响。采用自主研发的选区激光熔化成型设备和优化的脉冲激光,制备了不同角度的倾斜薄壁件。探论了成形角度范围在0〜90°的弧形薄壁件。结果表明,减小脉冲作用时间,有利于提高薄壁工件的精度和减少热积累对薄壁件的影响。脉冲激光在成形网格薄壁件时,可以明显改善“鼓包”问题。

In order to improve the ability of selective laser melting(SLM)to directly form thin-walled parts,the effects of forming process parameters such as pulse time,laser power,and scanning speed on single melt channels were discussed through experiments.In the self-developed selective laser melting molding equipment,optimized pulsed laser is used to form inclined thin-walled parts with different angles.The results show that reducing the pulse action time is beneficial to improve the accuracy of thin-walled workpieces and reduce the effect of heat accumulation on thin-walled workpieces.Pulsed laser can significantly improve the“bulge”problem when forming thin-walled mesh parts.Finally,the arc-shaped thin-walled parts with a forming angle ranging from 0 to 90°are discussed,which provides a certain reference for SLM to form arc-shaped workpieces at any angle.