Waalkes Lennart, Längerich Jan, Imgrund Philipp, Emmelmann Claus
Fraunhofer Research Institution for Additive Manufacturing Technologies IAPT, Am Schleusengraben 14, 21029 Hamburg, Germany.
Institute of Laser and System Technologies iLAS, Hamburg University of Technology TUHH, Denickestr. 17, 21073 Hamburg, Germany.
Materials (Basel). 2022 Jan 4;15(1):351. doi: 10.3390/ma15010351.
Piston-based material extrusion enables cost savings for metal injection molding users when it is utilized as a complementary shaping process for green parts in small batch sizes. This, however, requires the use of series feedstock and the production of sufficiently dense green parts in order to ensure metal injection molding-like material properties. In this paper, a methodological approach is presented to identify material-specific process parameters for an industrially used Ti-6Al-4V metal injection molding feedstock based on the extrusion force. It was found that for an optimum extrusion temperature of 95 °C and printing speed of 8 mm/s an extrusion force of 1300 N ensures high-density green parts without under-extrusion. The resulting sintered part properties exhibit values comparable to metal injection molding in terms of part density (max. 99.1%) and tensile properties (max. yield strength: 933 MPa, max. ultimate tensile strength: 1000 MPa, max. elongation at break: 18.5%) depending on the selected build orientation. Thus, a complementary use could be demonstrated in principle for the Ti-6Al-4V feedstock.
当活塞式材料挤出用作小批量坯件的补充成型工艺时，可为金属注射成型用户节省成本。然而，这需要使用系列原料并生产足够致密的坯件，以确保具有类似金属注射成型的材料性能。本文提出了一种方法，用于基于挤压力确定工业用Ti-6Al-4V金属注射成型原料的特定材料工艺参数。结果发现，对于95°C的最佳挤出温度和8mm/s的打印速度，1300N的挤压力可确保坯件高密度且无欠挤出。根据所选的成型方向，所得烧结部件的性能在部件密度（最大99.1%）和拉伸性能（最大屈服强度：933MPa；最大抗拉强度：1000MPa；最大断裂伸长率：18.5%）方面表现出与金属注射成型相当的值。因此，原则上可以证明Ti-6Al-4V原料可互补使用。
