异形毛细结构喷注器激光选区熔化成形技术分析

Analysis of forming technology of special-shaped capillaryinjector by selective laser melting

异形毛细喷注器是姿控发动机的核心组件,此类构件对流道内表面质量要求极高。为了实现激光选区熔化成形技术推广应用于上述产品以达到型号产品快速研制的目的,以异形毛细微孔流道表面质量为研究对象,利用激光超景深显微镜研究了不同成形角度下小孔表面形貌特征、表面粗糙度的变化规律,确定了异形毛细结构的成形角度在75°~90°范围内,成形构件上、下表皮表面质量均良好。基于异形毛细结构表面光整技术研究,实现了异形毛细结构的均匀光整,尺寸精度达±0.05 mm,表面粗糙度小于6.3μm,通过液流试验验证了激光选区熔化成形某喷注器液流性能,实现了异形毛细结构姿控喷注器的高性能一体化成形。

The special-shaped capillary injector is the core component of the attitude control engine.This type of component has extremely high requirements for the internal surface quality of the flow channel.In order to promote the application of SLM technology to the above products to achieve the purpose of rapid development of model products,taking the surface quality of the special-shaped capillary microporous channel as the research object,the surface morphology and surface roughness of the ostiole under different forming angles were studied by means of laser ultra-depth microscope.The capillary structure with good surface quality can be obtained by adjusting the forming angle within the range of 75°-90°.Based on the research of the surface finishing technology of the special-shaped capillary structure,the uniform finishing of the special-shaped capillary structure was realized,the dimensional accuracy is within±0.05 mm and surface roughness is less than 6.3μm.The liquid flow performance of the injector by SLM was verified by the liquid flow test,and the high performance integrated forming of the special-shaped capillary structure attitude control injector was realized.