超声振动辅助压装技术在过盈配合中的应用及性能优化

Application and performance optimization of ultrasonic vibration-assisted press-fitting technology in interference fits

在过盈配合过程中,为使接触面配合更加紧密并减小接触面之间的磨损,设计了超声振动辅助压装结构。根据变幅杆输出端与压装件匹配,确定了变幅杆尺寸;通过改变振子型号和数量调节压装装置的超声振动频率与功率。结果表明:引入超声振动后,轮毂内表面压装应力减小了20%,轴承外表面应力减小了17%;随超声频率和功率的提升,压装力减小了10%~20%,超声振动功率越大,频率越高,过盈配合所需的压装力就越小。压装过程引入超声振动有效改善了过盈配合的连接性能,减少了连接面的界面损失。

In the process of interference fit,in order to make the contact surface fit more closely and reduce the wear between the contact surfaces,an ultrasonic vibration-assisted press fit structure is designed.The dimensions of the horn are determined based on the matching of the output end of the horn with the press fit component,and the ultrasonic vibration frequency and power of the device are changed by altering the type and quantity of the vibrator.The results indicate that after the introduction of ultrasonic vibration,the press fit stress on the inner surface of the hub decreases by 20%,and the stress on the outer surface of the bearing decreases by 17%.With the increase of ultrasonic frequency and power,the press-fit force decreases by 10%to 20%.The greater the ultrasonic vibration power and the higher the frequency,the smaller the press fit force required for interference fit.The introduction of ultrasonic vibration in the press fit process effectively improves the connection performance of the interference fit and reduces the interface loss of the connection surface.