研究目的
Investigating the process of helical milling for the combined removal of support structures and finishing of bore holes in Ti6Al4V parts produced by selective laser melting (SLM), to understand the impact of support structure design on machining forces and surface roughness.
研究成果
The study demonstrates that helical milling can effectively combine support structure removal and precision machining of bore holes in SLM-produced Ti6Al4V parts. Support structure design significantly influences machining forces and surface roughness, with weaker structures allowing for better surface quality in a single machining step. The developed kinematic model accurately predicts material removal rates and their correlation with machining forces.
研究不足
The study focuses on Ti6Al4V parts produced by SLM with specific support structure designs. The findings may not be directly applicable to other materials or support structure configurations. The impact of tool wear on machining performance was not extensively analyzed.
1：Experimental Design and Method Selection:
Helical milling was used as the machining strategy for combined precision machining and removal of support structures. The process was analyzed in terms of axial and peripheral material removal rates, forces, and surface roughness.
2：Sample Selection and Data Sources:
Workpieces included SLM-produced Ti6Al4V parts with various support structure designs, solid SLM workpieces, and conventionally forged Ti6Al4V parts.
3：List of Experimental Equipment and Materials:
A machining center (Heller MC12), force plate (Kistler 9257B), surface measuring device (Mahr Surf XR 20), and a TiAlZrN-coated cemented carbide milling tool were used.
4：Experimental Procedures and Operational Workflow:
Helical milling was conducted with specific process parameters, and forces were measured in the workpiece coordinate system. Surface roughness was measured at two positions on the bore wall.
5：Data Analysis Methods:
Material removal rates were calculated and compared with measured forces to understand the impact of support structure design on machining dynamics.
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