HARMONIC ANALYSIS OF PORTALS FOR HEAVY GANTRY-TYPE MILLING MACHINES BY FEA
Dynamic FEA simulation of portals for two heavy gantry-type milling machines is provided. Rotary horizontal force and vertical oscillating force were applied to the spindle. FRFs were calculated. Excited eigenmodes (M1, M2, M4) revealed. Similarity and stability of both machine dynamic behavior was showed. Effects of antiresonance and crosstalk deformation are detected. Three appropriate for machining frequency ranges (pre-resonance, inter-resonance, post-resonance) are founded out. Possibility of mass reduction for HSM-aimed machines is showed.