夹紧误差对液压锁紧轴套锁紧扭矩的影响

摘要

Hydraulic clamping sleeves is the key part of S-axis NC machine tool,it is able to generate large elastic deformation by the hydraulic pressure and clamp rotational degree of freedom of spindle.Hydraulic clamping sleeves have important effects on machine tool positioning and machining accuracy.Clamping torque is an important parameter for the design of hydraulic clamping sleeves.To research the effect of hydraulic clamping sleeves working surface processingerror on clamping torque.Firstly,using the finite element method to calculate the clamping torque both considering the processingerror or not;and then obtain the experiment data by measuring the clamping torque by own design testing table;finally use the experiment data to verify the results data of finite element method.The results of verification illustrate that both of the calculating data by the finite element method and the experiment data curves have same tendency,the different forrs of working surface caused by processingerror affect the clamping torque.%液压锁紧轴套是五轴联动机床的关键部件,能够在压力载荷作用下发生较大的弹性变形,锁紧进给轴的转动自由度,对机床定位锁紧和加工精度有重要的影响,锁紧扭矩是液压锁紧轴套设计的重要参数.为研究轴套内工作表面在加工过程中产生的夹紧误差对液压锁紧轴套锁紧进给轴时产生的锁紧扭矩的影响,首先用有限元方法分别计算了液压锁紧轴套考虑夹紧误差和不考虑夹紧误差工作时产生的锁紧扭矩;然后在自主设计的实验台上进行锁紧扭矩测试实验;最后用实验数据对有限元方法计算数据进行验证.验证结果说明,有限元方法计算得到的理论数据相对实验数据曲线走势一致,由夹紧误差引起轴套内工作表面的不同形状直接影响锁紧扭矩.