CAJ | 학술논문

运用有限元分析软件ANSYS建立超高速磨床主轴系统的三维有限元模型，并对其进行模态分析，得到各阶固有频率和振型。针对超高速磨削过程中由转速产生的离心力的影响，先对主轴系统进行了静力分析，然后对其进行模态分析，获得各阶固有频率和振型。通过比较得知：考虑预紧力后，主轴系统固有频率都有提高。通过公式计算获得各阶固有频率所对应的临界转速，为磨削加工时避开共振频率提供理论指导。考虑到磨削力对主轴系统的激振力作用，利用Full法对主轴系统进行谐响应分析，获得了主轴跨中节点随激振力频率变化的幅频响应曲线，识别了产生共振的激振力频率。提出了进一步提高主轴动态特性的工艺措施。
운용유한원분석연건ANSYS건립초고속마상주축계통적삼유유한원모형，병대기진행모태분석，득도각계고유빈솔화진형。침대초고속마삭과정중유전속산생적리심력적영향，선대주축계통진행료정력분석，연후대기진행모태분석，획득각계고유빈솔화진형。통과비교득지：고필예긴력후，주축계통고유빈솔도유제고。통과공식계산획득각계고유빈솔소대응적림계전속，위마삭가공시피개공진빈솔제공이론지도。고필도마삭력대주축계통적격진력작용，이용Full법대주축계통진행해향응분석，획득료주축과중절점수격진력빈솔변화적폭빈향응곡선，식별료산생공진적격진력빈솔。제출료진일보제고주축동태특성적공예조시。
The 3D finite element model of spindle system on ultra-high speed grinder was built up by use of finite element analysis software ANSYS,and each order natural frequency and mode shape were obtained through modal analysis. The influence of the cen-trifugal force produced by high speed in ultra high speed grinding process should not be neglected,and each order natural frequency and vibration model were obtained by static analysis of spindle system first and modal analysis second. By comparison,the natural fre-quency of spindle system was increased after considering the pre-tightening force. The critical speed of each order natural frequency was calculated by the formula,and it provided theoretical guidance to avoid the resonance frequency of grinding. The harmonic re-sponse analysis of the spindle system was applied by using modal superposition method to consider the influence of vibration force,and the amplitude frequency response curve of spindle mid span with the change of excitation frequency was gotten and the excitation fre-quency which would lead to resonate was identified. The technology measure enhancing dynamic characteristics of spindle was put for-ward.