Abstract
In this study, a novel magnetorheological (MR) polishing device under a compound magnetic field is designed to achieve microlevel polishing of the titanium tubes. The polishing process is realized by combining the rotation motion of the tube and the reciprocating linear motion of the polishing head. Two types of excitation equipment for generating an appropriate compound magnetic field are outlined. A series of experiments are conducted to systematically investigate the effect of compound magnetic field strength, rotation speed, and type and concentration of abrasive particles on the polishing performance delivered by the designed device. The experiments were carried out through controlling variables. Before and after the experiment, the surface roughness in the polished area of the workpiece is measured, and the influence of the independent variable on the polishing effect is judged by a changing rule of surface roughness so as to obtain a better parameter about compound magnetic field strength, concentration of abrasive particles, etc. It is shown from experimental results that diamond abrasive particles are appropriate for fine finishing the internal surface of the titanium-alloy tube. It is also identified that the polishing performance is excellent at high magnetic field strength, fast rotation speed, and high abrasive-particle concentration.
Highlights
Titanium-alloy tubes have been increasingly applied in aerospace, military, chemical, and other fields to transport corrosive gas or liquid because they feature low density, high specific strength, and superior corrosion resistance [1]
Surface defects on the inner surface of titanium tubes caused by the machining process have a significant influence on their mechanical properties and lifespan
A novel MR polishing process based on magnetorheological abrasive honing (MRAH) was introduced to finish the internal surface of a ferromagnetic cylindrical workpiece [24,25]
Summary
Titanium-alloy tubes have been increasingly applied in aerospace, military, chemical, and other fields to transport corrosive gas or liquid because they feature low density, high specific strength, and superior corrosion resistance [1]. The aforementioned polishing processes can polish titanium alloys, accurate control of the finishing forces is difficult to achieve for most of them. A novel MR polishing process based on magnetorheological abrasive honing (MRAH) was introduced to finish the internal surface of a ferromagnetic cylindrical workpiece [24,25]. The combination of a permanent magnet and an electromagnet is expected to achieve accurate control of the finishing forces and a reduction of both the occupied space and the heat generated by the coils. Micromachines 2020, 11, Micromachines 2020, 11, 314 of a permanent magnet and an electromagnet is expected to achieve accurate control of the finishing forces and a reduction of both the occupied space and the heat generated by the coils. StrAedndgitthiobnaaslelyd, oan tehleectmroamgnaegtnicetficealnd asdtrjeunsgt tthhepmroavgidnedticbfyietlhdesptreernmgtahnebnatsemdaognnetht.eImn athginsestitcudfiye,lda nosvtreelnMgtRh pporloisvhidinegdpbryocethsse ispedremvealnoepnetdmtoagfinneist.hItnhethinistersntuadl ysu, rafanceovoefla MtitRanpiuomlis-hailnlogy pturobcee. sTswios tydpeevseolof peexdcitoatfiionnisehqtuhiepimnteenrtnalresudrefasicgenoefdattoitganeniuemra-taellaoycotumbpeo. uTwndo mtyapgens eotficexficeiltdat.ioTnheqeuffipecmtsenotf coamrepoduensidgnmeadgntoetigcefinelrdatsetraencgotmh,proutantidonmsapgeneedt,icanfdieltdy.peTshaenedffceocntsceonftrcaotimonpsooufnadbrmasaigvneeptiacrtfiicelleds onsttrheengptohl,ishrointagtipoenrfsoprmeeadn, caenadre tsyypsetesmaantdicaclolyncinenvetrsattigioantesdo. f abrasive particles on the polishing performance are systematically investigated
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