摘要
为了避免与工件干涉,内孔磨削需要采用细长的悬伸型主轴,这种结构导致主轴的动刚度较低,加工质量较差。针对该问题,以内孔磨床主轴为研究对象,提出几种立式磨床主轴动刚度加强方案。基于模态分析理论,采用有限元方法对其进行刚度计算,通过对比各方案主轴的静刚度和固有频率,确定了最佳的改进方案。最后对此方案进行了实验测试,与原方案对比结果表明加强措施可以提高机床主轴的动刚度一倍以上。研究结果表明,在机床加工工艺允许的范围内,对其采取一定的加强措施,可极大地提高机床的磨削加工效率和磨削质量。
In order to escape interference of spindle and workpiece, suspended long spindle is necessary to internal grinding machine. The type of structure lead to a lower dynamical stiffness of spindle. Aiming at the problem, some schemes are proposed to improve the dynamic stiffness of vertical grinding machine spindle. According to modal theory, calculate and analyze the dynamic stiffness of these types of spin- dles by FEM. By comparing the stiffness and natural frequency the spindle structure with optimization scheme is decided. Finally test the vibration of improved and original machine spindle, and compare tes- ting result. It is shows that the dynamic stiffness of new spindle is increased by two times. By which we can concludes that while some reasonable strength measures are taken for spindle under process condi- tion, grinding efficiency and surface quality will be improved greatly.
出处
《组合机床与自动化加工技术》
北大核心
2013年第11期95-98,共4页
Modular Machine Tool & Automatic Manufacturing Technique
基金
国家自然科学基金(51275347)
关键词
磨床主轴
模态分析
动刚度
grinding machine spindle
modal analysis
dynamic stiffness
