摘要
目的探究不同超声参数对螺纹副拆卸扭矩及表面形貌的影响。方法由于拆卸扭矩由螺纹副接触面摩擦力决定,因此对不同超声方向、振幅和频率下超声拆卸螺纹副的减摩趋势进行分析。基于模态耦合原理的超声试验装置进行螺纹副拆卸试验,分别记录不同超声参数下扭矩传感器输出的拆卸扭矩,并进行对比,使用超景深显微镜观察拆卸后螺纹面的形貌。结果扭向、纵向、纵扭复合3个方向的超声减摩率分别为4.5%、10.2%、11.9%,在显微镜下普通拆卸的螺纹表面有较大的剥落屑。施加超声后,大块剥落屑变为剥落颗粒,螺纹面损伤依次减小;在超声振幅为0.1、0.3、0.5μm时,其减摩率分别为2.9%、7.9%、11.9%;振幅为0.1μm的表面有大面积的剥落颗粒以及部分划痕;当振幅增加到0.5μm时,剥落颗粒基本消失,螺纹面损伤呈降低趋势;在超声频率为20、28、40 kHz时,其减摩率分别为11.2%、11.5%、11.9%,螺纹面的烧蚀面积逐渐增大。结论纵扭复合超声的减摩效果最好,且螺纹面损伤最小。随着超声振幅的增加,减摩效果提高,螺纹面损伤降低。超声频率对螺纹副拆卸的减摩效果的影响较小,但频率的增加会导致接触面烧蚀面积增加,因此在超声方向和超声振幅相同的前提下,选用低频超声更适宜。研究结果可以为超声螺纹副拆卸装置的设计提供参考。
In the exploration of disassembling threaded pairs,researchers are actively developing tools with a focus on minimizing removal torque,often overlooking the subsequent damage to the threaded surface post-disassembly.This oversight can significantly diminish the utility in contexts demanding high precision for secondary assembly.The incorporation of ultrasound,known for its friction-reducing and material-softening capabilities,is being examined for its role in threaded pair disassembly.The work aims to elucidate the impact of varying ultrasonic parameters and initial tightening torque on both the dismantling torque and the threaded surface morphology.Since the disassembly torque magnitude was intricately linked to the friction encountered on the contact surface of the threaded pair,a comprehensive theoretical analysis was carried out to explore the friction reduction trends of ultrasonically disassembled threaded pairs under various ultrasonic directions,amplitudes,and frequencies.To facilitate this exploration,an experimental apparatus,grounded in the principles of ultrasonic coupling,was employed for conducting the threaded pair dismantlement experiments and the disassembly torque output from the torque transducer under different ultrasonic parameters was recorded,which was compared with that of the normal disassembly torque to derive the friction reduction rate.Finally,the disassembled nut was dissected from the middle,and the surface morphology of the threads after normal disassembly and ultrasonic disassembly was observed by a super depth-of-field microscope.Current findings reveal that the friction reduction rates achieved through torsion,longitudinal,and longitudinal-torsion composite ultrasonic directions stand at 4.5%,10.2%,and 11.9%,respectively.Microscopic analysis of post-disassembly exposes that nuts exhibit large flaking chips on their threaded surfaces.The application of ultrasound,however,morphs these chips into smaller flakes,effectively mitigating surface damage.Additionally,the study notes frict
作者
王奔
李展业
赵哲
宋畅
季财行
李昕旸
WANG Ben;LI Zhanye;ZHAO Zhe;SONG Chang;JI Caihang;LI Xinyang(School of Electromechanical Engineering,Shenyang Aerospace University,Shenyang 110136,China;AECC Shenyang Engine Research Institute,Shenyang 110015,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2024年第23期169-179,共11页
Surface Technology
基金
辽宁省应用基础研究项目(2023JH2/1013002427)
辽宁省“兴辽英才”计划(XLYC2007011)
辽宁省教育厅基本科研业务费项目(LJ222410143059,LJ232410143042)。
关键词
超声振动
模态耦合
纵扭复合
螺纹副
减摩率
ultrasonic vibration
modal coupling
longitudinal torsional composite
threaded pair
friction reduction rate
