永磁交变磁场磁粒研磨装置及试验研究

Study on magnetic particle grinding device with permanent magnet alternating field and experiments

为改善平面磁粒研磨加工的效果,增强磁场的变化,使磨料进行翻滚更新。本文设计一种永磁交变磁场磁粒研磨装置,此装置采用了永磁交变磁极产生的交变磁场进行磁粒研磨加工。利用软件对永磁交变磁场进行模拟仿真,并观察研磨区域磁感应强度的变化。在研磨试验中,用SUS304不锈钢板件作为试验件,研磨时间为30 min,磁性磨料粒径为80目,主轴转速分别为150 r/min、200 r/min、250 r/min。使用超景深显微镜与触针式粗糙度测量仪对工件加工前后的表面形貌与粗糙度进行检测。通过对比可得,SUS304不锈钢板的表面形貌逐渐改善,纹理和凹坑基本去除;表面粗糙度由原始的0.329μm降至0.069μm,达到了光整加工的效果。采用永磁交变磁场磁粒研磨装置可以加快磁性磨粒的更新,使研磨轨迹更加复杂化,从而提升研磨效果,提高研磨效率。

In order to improve the effect of planar magnetic abrasive finishing,the change of magnetic field is enhanced to make the abrasive roll and renew.In this paper,a magnetic particle grinding device with permanent magnet alternating field was designed.The device uses the alternating magnetic field generated by the permanent magnet alternating pole for magnetic particle grinding processing.Software was used to simulate the permanent magnet alternating magnetic field and observe the change of magnetic induction intensity in the grinding area.During the grinding experiment,SUS304 stainless steel plate was used as workpiece,grinding time is 30 min,magnetic abrasive particle size is 80 mesh,the spindle speed is 150 r/min,200 r/min and 250 r/min.Surface morphology and roughness of the workpiece before and after grinding were compared by using ultra depth microscope and stylus roughness measuring instrument.By comparison,it can be concluded that surface morphology of SUS304 stainless steel plate is gradually improved,nearly all the texture and pits were removed.Surface roughness is reduced from the original 0.329μm to 0.069μm,and the effect of finishing is achieved.Usage of permanent magnet alternating magnetic field magnetic particle grinding device can speed up the renewal of magnetic particles,and make the grinding track more complicated,thus improving the grinding effect and grinding efficiency.