doi:10.16186/j.cnki.1673-9787.2021020010

Received:2021/02/02

Revised:2021/03/22

Published:2022/05/15

Structural design and experimental study of an ultrasonic motorized spindle adapted to automatic tool changing

LIU Jianhui, MA Zhipeng, GUO Xingchen

School of Mechanical and Power Engineering， Henan Polytechnic University， Jiaozuo 454000 ， Henan，China

Abstract:Considering the influences of ultrasonic vibration on spindle rotation accuracy and service life , an ultrasonic motorized spindle adapted to automatic tool changing was presented, and the HSK tool holder was used as a part of the composite half-wave length ultrasonic horn. Dimension parameters and working frequency of the horn were calculated based on the theory of four-end network,in which the contact surface between the clamping unit and the tool holder was used as the theoretical node of the horn. The free modal analysis results showed that the critical speed of the spindle and modal shapes of the horn at working frequency were consistent with theoretical calculation. The modal analysis with prestress showed that the horn could work normally when subjected to clamping force. Through impedance analysis and amplitude measurement , the working frequency of the horn was 20 552 Hz, and the tool end produced a stable periodic vibration of 5 μm in amplitude at this frequency. The results of the study could promote the application of ultrasonic machining center.

Key words:ultrasonic motorized spindle;ultrasonic horn;four-end network method;modal analysis;critical speed;automatic tool changing

适应自动换刀功能的超声电主轴结构设计及实验研究_刘建慧.pdf