Functionalization of parts by generating an internal structure using SLM and post-processing methods

选择性激光熔化(SLM)是一种工业应用越来越广泛的添加剂制造技术。这主要是由于零部件的几何设计自由度和良好的机械性能相结合。通过这种技术，还可以在部件中设置定义的孔隙率，从而使材料功能化。虽然残留的粉末在工艺过程中用作支撑结构，但必须在制造工艺后手动移除，并且成本高昂。液态二氧化碳高压爆破(HDCO2)可实现各种材料的干燥和无残渣处理。在IWF，利用专门开发的测试装置，可以产生压力高达3000巴的液态二氧化碳射流。液态二氧化碳射流在完全进入气相之前，暂时可用于加工工件和表面。关于射流冲击力、射流速度和缺口几何形状的最新结果表明，该工艺适合于清洗，并具有工业应用潜力。在本项目中，基于SLM工艺参数对内部结构部件上粉末粘结形成的影响的调查，研究了HDCO2工艺在添加制造的内部结构部件的后处理中的适用性。

Selective Laser Melting (SLM) is an additive manufacturing technique with increasing industrial relevance. This is mainly due to the combination of geometric design freedom and good mechanical properties of the components. With this technique, it is also possible to set a defined porosity in the components and thus to functionalize the material. While the residual powder serves as a support structure during the process, it must be removed manually and costly after the manufacturing process. High-pressure blasting with liquid CO2 (HDCO2) enables a dry and residue-free processing of various materials. At the IWF, with a specially developed test-setup, a liquid CO2 jet with a pressure of up to 3000 bar can be generated. The liquid CO2 jet is temporarily usable for the machining of workpieces and surfaces before it passes completely into the gas phase. Recent results on jet impact forces, jet velocities and notch geometries show that the process is suitable for cleaning and offers potential for industrial application. In the present project, based on investigations on the influence of the SLM process parameters on the formation of powder adhesions on internally structured components, the applicability of the HDCO2 process for the post-processing of additively manufactured, internally structured components is investigated.