Abstract
The assembly of a gantry type high-speed drilling machine was designed with 3D design software. The analysis of the static and dynamic of the gantry was performed by using a finite element software. The results show that, the existing model has perfectible dynamic and static performance, the safety factor of strength reaches 10.5, static stiffness is 186.6KN/mm, and can meet the requirements. The maximum amplitude of dynamic response of the gantry is reached at the third order modal when the rated spindle speed is 3400 RPM(56.7Hz). In order to avoid the resonance and to ensure the machine with longer service life and high manufacture precision, the spindle speed should be adjusted under 3000RPM. The analysis shows that the design of the existed model is reasonable. However during the further design and optimization, the designers can also reinforce the stiffness of the gantry by reducing the weight of the spindle boxes and increasing the torsional stiffness of the uprights.
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