Abstract
In this study, design and analysis of a gantry-type 5-axis CNC machine tool is presented with experimental results on a manufactured prototype. Critical points in the design of a large-scaled and heavy-duty machine tool is discussed. Moreover, FE analysis results is also presented with detailed discussion. The measurement results on structural dynamics is shown together with the FE results. Furthermore, the final performance of the machine tool is demonstrated thorough position and velocity measurements of the axes.
Highlights
The fast and competitive development of aerospace, automotive and die/mould industries drive machine tool companies to offer better solutions for heavy-duty machining applications
Fork head spindle structures are employed for heavy-duty 5-axis gantry-type milling machines with 95 to 120 degrees rotation capacity at A-axis, while Caxis can rotate 360 degrees
Y-axis strokes between 2500 and 3000mm are accepted as standard lengths for large-scaled 5-axis gantry-type machine tools which are produced with welding techniques
Summary
The fast and competitive development of aerospace, automotive and die/mould industries drive machine tool companies to offer better solutions for heavy-duty machining applications. A competitive heavy-duty 5-axis gantry milling machine can process workpieces that are ranged from 16 to 20 tones, with 8 to 10 μm axial precision at X and Y of machine coordinates, while positional accuracy ranges from 10 to 15 μm for these axes. Y-axis strokes between 2500 and 3000mm are accepted as standard lengths for large-scaled 5-axis gantry-type machine tools which are produced with welding techniques. Thermal compensation techniques are not very effective for large-scaled machine tools, and thermal design/optimization requires advanced techniques for thermal distortion detection and compensation even for a medium gantry-type 5-axis CNC machine [10]. Regarding the above-mentioned facts, this study demonstrates casting method-benefited design strategies for a 5-axis gantry-type CNC machine tool. The effectiveness of the proposed strategies is evaluated with FE analyses and experiments on a prototype machine tool manufactured
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