为了加工直径320 mm,高度250 mm的工件，在保证各类相关尺寸的情况下设计了一种床身和龙门框架为矿物质材料的五轴直驱复合加工中心。为了减轻机床的质量并降低其重心，对矿物质材料龙门框架进行以提高模态性能和柔度最小化为目标的拓扑优化设计，再用多目标遗传算法对拓扑优化后的龙门框架进行尺寸优化，并前后多次对其动、静态性能进行仿真分析和比较。对比市场现有铸铁龙门框架与最终优化后的矿物质材料龙门框架，结果显示：矿物质材料龙门框架质量上降低了15.03％，最大变形降低了8.7％，最大应力降低56.68％，一阶固有频率增大了23.45％。优化后的矿物质材料龙门框架在静、动态特性以及轻量化方面都要明显优于铸铁龙门框架支承件。
In order to process workpieces with a diameter of 320 mm and a height of 250 mm,a five-axis direct-drive compound machining center with mineral materials for the bed and gantry frame was designed while ensuring various contact dimensions.In order to reduce the weight of the machine tool and reduce its center of gravity,the mineral material gantry frame was designed to improve the modal performance and minimize the flexibility as the goal of topology optimization design,and then the multi-objective genetic algorithm was used to optimize the size of the topologically optimized gantry frame.And its dynamic and static performance was carried out simulation analysis and comparison many times before and after.Compared with the existing cast iron gantry frame in the market and the finally optimized mineral material gantry frame,the results show that the quality of the mineral material gantry frame decreases by 15.03%,the maximum deformation decreases by 8.7%,the maximum stress decreases by 56.68%,and the first order natural frequency increases by 23.45%.The optimized mineral material gantry frame is significantly better than the cast iron gantry frame support in terms of static and dynamic characteristics and lightweight.
SONG Zengyu, PENG Jinmin, HU Gaoshang, ,YU Luojian. Optimal Design and Analysis of Mineral Material Gantry Frame for Direct-drive Machine Tools[J]. Machine Tool & Hydraulics,2022,50(24):87-93