| In this paper, being the research background of machining of micro components, gantry micro milling system was designed. Its size is 600mm*600mm*500mm, and there are four linear axis and one rotation axis in the system. The processing range is 200mm*50mm*50mm.According to the basic processing requirements of micro components, the whole system and components were designed. At first the finite element analysis software was applied to analyze the gantry structure and studied the deformation trend and location of max deformation. Then the modal analysis was carried out on the gantry structure and obtained the natural frequency and the main vibration form of system. Based on deformation trend and model of gantry structure, optimized the multi-objective parameters of beam and column, and enhanced the static and dynamic stiffness, thus improved the performance of system. Using the hammer test method of modal to test machine, obtained the natural frequency and damping ratio under actual situation, and confirmed the validity of finite element analysis.The error model was established based on the theory of multi-body system and analyzed each link that would affect the system errors. The establishment of error model for the gantry micro milling system provided the basis for the error compensation in the processing.The gantry micro milling system served as the platform of test, and orthogonal tests on micro milling was conducted. We acquired the reasonable cutting parameters when studied the rules how cutting parameters(spindle speed, axial depth of cut, feed rate) affected surface roughness of component. And conducted the calculation of surface roughness of component, which verified the stability of gantry micro milling system when processing. It shows the reasonability of cutting parameters selected. |
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