摘要
根据赫兹接触模型和经典碰撞理论,并考虑返向器与螺母的固连关系,建立了滚珠与返向器碰撞接触的力学模型,导出了碰撞力公式,并在考虑弹性恢复系数的基础上推导出了碰撞接触时间公式。设计专门的试验装置对碰撞接触的时间进行了测试,测试结果表明,新建立的模型比现有文献的模型更符合实际情况。在试验的基础上,利用数值模拟方法分析了碰撞角度、结构参数和材料参数等因素对碰撞力的影响。
A Mechanical model of impact and contact between the ball and re-circulating mechanism in ball screw was brought forward according to the Hertz contact model and classical impact theory, along with the joint relationship of re-circulating mechanism and nut taken into account. Then the formula of the impact force and contact time was induced, which the elastic coefficient of restitution was considered in contact time calculation. Moreover,a special test unit was designed for contact time measurement and the contact time was measured. The result indicates that the new model proposed herein is closer to the practical situation than the old model proposed in literature. Based on the work mentioned above, the influence of impact angle, parameters of structure and material on impact force was analyzed by numerical simulation.
出处
《中国机械工程》
CAS
CSCD
北大核心
2008年第7期850-853,881,共5页
China Mechanical Engineering
基金
国家自然科学基金资助项目(50675124)
