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针对拨叉在加工过程中所产生的弹塑性变形问题,提出利用动头的超声振动运动对拨叉的加工弹塑性变形进行矫正。首先,利用弹塑性理论对拨叉的变形机理进行分析,并通过有限元仿真得出了拨叉的弹塑性变形规律曲线。然后,采用二分法计算拨叉变形矫正参数,并获得了拨叉弹塑性变形矫正的规律性曲线,建立了拨叉变形矫正的数学模型;提出了超声振动矫形的方法,并对超声振动系统进行了设计,利用ANSYS Workbench对超声振动系统进行模态仿真分析,得出系统最佳工作频率为20 kHz。最后,对振动矫形系统的矫形效果进行了分析,验证了振动矫形方法的可行性与合理性。
Aiming at the elastic-plastic deformation of the fork in the process of machining, it is proposed that the elastic plastic deformation of the fork should be corrected by the dynamic ultrasonic vibration. First of all, the deformation mechanism of fork is analyzed based on elasto-plastic theory, and the elastic-plastic deformation curve of fork is obtained through finite element simulation. Then, the bifurcation method was used to calculate the parameters of the fork deformation correction, and the regularity curve of the elastic deformation of the fork was obtained. The mathematical model of the fork deformation correction was established. The ultrasonic vibration orthopedic method was put forward and the ultrasonic vibration system The design and the use of ANSYS Workbench to simulate the ultrasonic vibration system show that the best working frequency of the system is 20 kHz. Finally, the orthopedic effect of the vibration orthopedic system is analyzed, and the feasibility and rationality of the vibration orthopedic method are verified.