摘要
为探索提高数控机床的综合性能,以某卧式加工中心铸铁床身为原型,设计了一种钢板-混凝土复合结构床身.采用正交实验、灰色关联和组合赋权相结合的方法对其结构进行优化并得到了最优的参数组合,对复合结构床身进行有限元仿真分析,并将结果与原型铸铁床身比较.结果表明:在床身质量仅增加2.3%的情况下,复合结构床身的最大静应力和最大静变形分别降低了51.3%和82.9%;前三阶固有频率提高了143.9%、156.8%和148.7%;x轴导轨和z轴导轨中心节点在x、y、z方向上的最大振幅降低了97.6%、97.1%、94.0%和99.6%、97.9%、85.4%;导轨滑块连续在导轨表面摩擦1800s时导轨的最大热-结构耦合变形量降低了7.3%.
To improve the comprehensive performance of CNC machine tools,a steel-concrete composite structure bed is designed,based on a certain horizontal machining center cast iron bed.The method of orthogonal experiment,grey theory and combination weighting is used to optimize its structure,the optimal parameter combination is obtained.Finally,the finite element simulation analysis of the composite structure bed is carried out,and the results are compared with the prototype cast iron bed.The results show that:when the bed mass is increased by 2.3%,the maximum static stress and the maximum static deformation of the composite structure bed are reduced by 51.3%and 82.9%,respectively.The first three natural frequencies are increased by 143.9%,156.8%and 148.7%,respectively.The maximum amplitudes of the center nodes of x-axis guide rail and z-axis guide rail in x,y and z directions are decreased by 97.6%,97.1%,94.0%and 99.6%,97.9%85.4%.When the sliding block of the guide rail continuously rubs on the guide rail surface for 1800 second,the maximum thermal-structural coupling deformation of the guide rail is reduced by 7.3%.
作者
郭润兰
邓文强
李典伦
GUO Run-lan;DENG Wen-qiang;LI Dian-lun(School of Mechnical and Electrical Engineering,Lanzhou Univ.of Tech.,Lanzhou 730050,China)
出处
《兰州理工大学学报》
CAS
北大核心
2021年第5期53-58,共6页
Journal of Lanzhou University of Technology
基金
国家自然科学基金(51965037,51565030)。
关键词
复合结构床身
正交实验
灰色关联分析
组合赋权
多目标优化
composite structure bet
orthogonal experiment
grey relational analysis
combination weighting
multi-objective optimization
