基于多孔喷嘴技术的阵列微织构仿真与实验

Simulation and experimental of array microtexturing based on porous nozzle technology

射流电解加工单孔喷嘴系统存在显著不足,不能适用于大规模表面微织构制造,因此提出多孔条形喷嘴加工工艺。利用不受加工结构限制的3D打印技术制作多孔喷嘴模型,搭建射流电解加工实验装置。利用Comsol软件进行流场与电场仿真,以喷嘴到工件表面流速大小和电流密度等为评价依据,对喷嘴腔体内部流道进行优化。研究表明,条形喷嘴结构能够形成形态稳定的射流,对工件实现高效加工。当加工电压为475 V、占空比为70%时,材料去除率达到峰值。

In response to the significant shortcomings of the single-hole nozzle system for jet electrolytic machining,which is not applicable to the field of manufacturing large-scale surface micro-weave structures,a porous strip nozzle machining process is proposed.The porous nozzle structure was fabricated using 3D printing technology,which is not limited by the processing structure,and the jet electrolysis machining device was constructed.Comsol software was used to simulate the flow field and electric field,and the flow channel inside the nozzle cavity was optimised based on the evaluation of the flow rate from the nozzle to the surface of the workpiece and the current density.The study shows that the bar nozzle structure can form a stable jet to achieve efficient machining of the workpiece.The peak material removal rate was achieved at a machining voltage of 475 V and a duty cycle of 70%.