液压膨胀夹具夹紧性能影响因素分析及优化设计

为优化液压膨胀夹具夹持性能，利用有限元软件分析了某液压膨胀夹具系统的不同结构及配合参数对工件夹紧变形、夹紧力矩、锁紧刚度的影响规律，并采用多目标优化方法对参数进行了优化分析。结果表明:通过调整液压膨胀套夹具的结构和配合参数，能使液压膨胀夹具的夹持性能显著提高，工件中部的夹紧变形量由 12 μm 减小到 3.2 μm，两端的夹紧变形量由 28 μm 减小到 4.8 μm，工件的最大应力由 435.9 MPa 减小到85.7 MPa。

Analysis and Optimum Design of Factors Affecting Clamping Performance of Hydraulic Expansion Fixture

Aiming at the optimization of clamping performance of hydraulic expansion fixture, the influence of different structure and matching parameters of a hydraulic expansion fixture system on workpiece clamping deformation, clamping moment and locking stiffness was analyzed by finite element software, and above parameters were optimized and analyzed by multi-objective optimization method. The results show that by adjusting the structure and matching parameters of the hydraulic expansion sleeve fixture, the clamping performance of the hydraulic expansion fixture has been significantly improved. The clamping deformation of the middle part of the workpiece has been reduced from 12 to 3.2 μm, the clamping deformation of the two ends has been reduced from 28 to 4.8 μm, and the maximum stress of the workpiece has been reduced from 435.9 MPa to 85.7 MPa.