CAJ | 학술논문

　　研究G型结构立式镗铣机床工作空间位置刚度随工作空间体积变化规律．根据联接单元特征，将主轴轴承、线性导轨及丝杠等动联接采用弹簧等效；建立整机静刚度预测实体模型；结合有限元方法数值模拟工作台、主轴及整机X、Y 、Z误差敏感方向工作空间的位置刚度分布，以离散点试验验证研究立式镗铣机床 X、Y 、Z三向的静刚度．结果表明：机床离散点试验获得的静刚度数据与数值计算结果最大误差为8．7％，主轴三向静刚度随 Z轴行程增加而非线性减小，工作台 X、Y 轴中间位置三向静刚度最大，呈抛物状向外递减，机床整机静刚度同工作台静刚度呈相似分布规律．数值模拟数据为G型精密机床结构设计及位置误差补偿提供了理论基础．
　　연구G형결구입식당선궤상공작공간위치강도수공작공간체적변화규률．근거련접단원특정，장주축축승、선성도궤급사강등동련접채용탄황등효；건립정궤정강도예측실체모형；결합유한원방법수치모의공작태、주축급정궤X、Y 、Z오차민감방향공작공간적위치강도분포，이리산점시험험증연구입식당선궤상 X、Y 、Z삼향적정강도．결과표명：궤상리산점시험획득적정강도수거여수치계산결과최대오차위8．7％，주축삼향정강도수 Z축행정증가이비선성감소，공작태 X、Y 축중간위치삼향정강도최대，정포물상향외체감，궤상정궤정강도동공작태정강도정상사분포규률．수치모의수거위G형정밀궤상결구설계급위치오차보상제공료이론기출．
The position static stiffness variation of G-type frame structure vertical machine center on work space volume is studied .Based on the feature of joints ,the spindle bearings ,linear slide-ways and guide screw are equivalent to the springs . The static stiffness prediction model of complete machine is built .The X ,Y and Z sensitive direction position stiffnesses of column ,table and vertical machine center are calculated using the finite element method . Meanwhile , the static stiffness of vertical machine center is verified by discrete point experiment . Results show that the maximum relative error of simulation and experiment is 8 .7% , the X , Y and Z sensitive direction static stiffnesses of spindle nonlinearly decrease in Z travel .The static stiffness of table in X ,Y plane is a parabolic shape ,the maximum is in the center ,the minimum is in the border .The variation of static stiffness of the complete machine is similar to the table .The data of simulation provide a theory basis for the design of G-type frame structure vertical machine center and position error compensation .