摘要
目的在传统的平面磁粒研磨加工中添加脉冲辅助磁场,增大加工区域中磁感应强度和加工时磁感应强度动态变化,丰富磨料粒子在加工时的运动形式,使研磨轨迹复杂化,降低工件表面粗糙度,获得更好的工件表面形貌。方法通过分析磨料粒子在有无辅助磁场时各自的受力情况,探究辅助磁场对磨料在加工时运动状态的影响,研究脉冲辅助磁场下磨料的运动行为机理。利用Ansoft Maxwell软件对电磁铁不同形状的磁极头产生的磁场进行模拟对比,确定理论上最优的磁极头形状。同时模拟对比脉冲电流在不同时刻加工区域内磁感线的分布情况,以及恒定磁场和脉冲磁场下磨料的运动轨迹。通过试验对比无辅助磁场、恒定辅助磁场和脉冲辅助磁场下磁粒研磨加工SUS304不锈钢的表面形貌和表面粗糙度。结果在磁粒研磨加工中,磁性磨料分布受磁感线的影响,在脉冲辅助磁场的作用下加工区域内的磁性磨料会随磁感线的变化而做周期性的往复运动,加工时会有更为复杂的研磨轨迹。模拟3种不同形状的磁极头在加工区域产生的磁感应强度曲线,平面、圆锥面和半球面在中点处的磁感应强度峰值分别为655、636、702 mT。以SUS304不锈钢板作为试验对象,原始表面粗糙度为0.46μm,采用半球形的电磁铁磁极头,在研磨间隙为2 mm、永磁极转速为800 r/min、进给速度为5 mm/s的试验条件下,对比电磁铁不通电、通入0.8 A直流电流、通入1 Hz,占空比50%,峰值电流0.8 A的单向脉冲电流3种辅助磁场分别对工件研磨30 min后的工件表面形貌,无辅助磁场时工件表面仍残留一些原始纹理;恒定辅助磁场下工件表面原始纹理被去除,但表面存在明显圆弧形研磨痕迹;脉冲辅助磁场下工件表面形貌更为光整、平滑。研磨后工件表面粗糙度分别降至0.28、0.13、0.06μm。结论脉冲磁场辅助磁粒研磨在提高加工区域磁�
The work aims to add pulse assisted magnetic field in the traditional plane magnetic abrasive finishing process to increase the magnetic induction intensity in the processing area and the dynamic change of magnetic induction intensity during processing,enrich the movement form of abrasive particles during processing,complicate the grinding path,reduce the surface roughness of workpiece,and obtain better surface topography of workpiece.The effects of the assisted magnetic field on the motion state of the abrasive in processing were studied by analyzing the forces of the abrasive particles with or without the assisted magnetic field,and the motion mechanism of the abrasive under the pulse assisted magnetic field was studied.The magnetic field generated by the different shape of the pole head of the electromagnet was simulated and compared with Ansoft Maxwell,and the optimal pole head shape was determined.At the same time,the distribution of magnetic induction lines in the processing area was compared when the electromagnet was on and off,and the trajectories of abrasive under constant magnetic field and pulsed magnetic field were compared.The surface morphology and specific surface roughness of SUS304 stainless steel without assisted magnetic field,with constant assisted magnetic field and pulse assisted magnetic field were compared by experiments.The distribution of magnetic abrasive was affected by magnetic induction line in the magnetic abrasive finishing process.Under the action of pulse assisted magnetic field,the magnetic abrasive in the processing area made periodic reciprocating motion with the change of magnetic induction line,and there was a more complex grinding track in the processing.The magnetic induction intensity curves generated by three different shapes of magnetic poles in the processing area were simulated.The peak values of magnetic induction intensity at the midpoint of horizontal plane,conical surface and hemispheric surface were 655,636 and 702 mT,respectively.The SUS304 stainless steel plat
作者
杨欢
陈松
张磊
徐进文
陈燕
YANG Huan;CHEN Song;ZHANG Lei;XU Jin-wen;CHEN Yan(School of Mechanical Engineering&Automation,University of Science and Technology Liaoning,Anshan 114051,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2022年第2期313-321,共9页
Surface Technology
基金
国家自然科学基金(51775258)
辽宁省教育厅项目(2020FWDF07)
辽宁科技大学基金(2018FW05)。
关键词
脉冲磁场
电磁
磁粒研磨
SUS304不锈钢板
表面粗糙度
表面光整加工
pulsed magnetic field
electromagnetic
magnetic abrasive
SUS304 stainless steel plate
surface roughness
surface finishing
