大功率超声波焊接纯铜的动态摩擦及超声软化过程

doi:10.13229/j.cnki.jdxbgxb.20231176

摘要/Abstract

摘要：

采用有限元方法，依据界面温度和焊头下压位移的试验结果，探索了纯铜超声波焊接时摩擦及材料软化过程，并分析了焊接过程的温度场及塑性应变分布。结果表明：所建模型能较好模拟焊接动态摩擦系数超声软化变化过程。工件接触面的平均摩擦系数在焊接初期快速增加，之后急剧下降，并在焊接时间0.2 s后呈现较平稳的波动。铜的超声软化系数在焊接初期急剧增加，之后缓慢增加，并在焊接时间0.3 s后明显增加。超声软化是材料塑性变形的主要物理机制。

关键词: 材料合成与加工工艺, 超声波焊接, 有限元模拟, 摩擦系数, 超声软化

Abstract:

Based on the experimental results of interfacial temperature and sonotrode displacement， the finite element method was employed to investigate the friction and material softening process in pure copper ultrasonic welding， and the distribution of the temperature fields and plastic strain during the welding process were also analyzed. The results show that the established model can better simulate the dynamic friction coefficient and ultrasonic softening variation processes during welding. The average friction coefficient of the workpiece contact surface increased rapidly in the early stages of welding， and then decreased sharply， and presented smooth fluctuations after welding time of 0.2 s. The ultrasonic softening coefficlent of copper increased sharply in the early stages of welding， then slowly increased， and began to increase significantly when the welding time was 0.3 s. Ultrasonic softening is the main physical mechanism of materials plastic deformation.

Key words: materials synthesis and processing technology, ultrasonic welding, finite element simulation, friction coefficient, ultrasonic softening

中图分类号:

TG456.9

李欢,刘千喜,张长鑫,张健. 大功率超声波焊接纯铜的动态摩擦及超声软化过程[J]. 吉林大学学报(工学版), 2025, 55(8): 2548-2554.

Huan LI,Qian-xi LIU,Chang-xin ZHANG,Jian ZHANG. Dynamic friction action and ultrasonic softening during high-power ultrasonic welding process of pure copper[J]. Journal of Jilin University(Engineering and Technology Edition), 2025, 55(8): 2548-2554.

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