| 摘要: |
| 针对 304 不锈钢管内表面的氧化膜难加工以及加工后表面存在沟状纹理、微裂纹、凹坑等质量问题，采用磁粒研磨法去除 304 不锈钢管内表面氧化膜。通过设计不同锥度的磁极头并结合模拟仿真，探究加工区域磁场强度和研磨压力变化规律，最后通过研磨试验与仿真进行对比。结果表明：随着磁极头锥度增大，磁场强度呈先增大后减少的趋势，研磨压力受磁场强度的影响较大也呈先增大后减小趋势。当磁极头锥度为 80°时磁场强度最强，研磨压力最大，研磨后管件内表面粗糙度 Ra 由原始 3.06 μm 降至 0.23 μm，表面最大高度差由原始 47.4 μm 降至 19.6 μm，内表面的氧化膜均被去除，呈现出均匀的研磨痕迹。磁性磨粒运动受力仿真以及研磨试验均表明，采用 80°仿形磁极头进行加工可以有效提高 304 不锈钢管内表面质量。 |
| 关键词: 仿形磁极头 磁粒研磨 交变磁场 研磨压力 304 不锈钢管 表面质量 |
| DOI：10.11933/j.issn.1007?9289.20220119001 |
| 分类号:TG356 |
| 基金项目:国家自然科学基金(51775258)、辽宁省自然科学基金重点(20170540458)和精密与特种加工教育部重点试验室基金(B201703)资助项目 |
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| Effect of Profiling Magnetic Pole Head on the Inner Surface of Electromagnetic Finishing Pipe Fittings |
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PAN Mingshi, CHEN Yan, ZHANG Dongyang
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School of Mechanical Engineering and Automation, University of Science and Technology Liaoning,Anshan 114051 , China
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| Abstract: |
| In view of the difficulty in processing the oxide film on the inner surface of the 304 stainless steel tube and the quality problems such as groove-like texture, micro-cracks and pits on the surface after processing, the magnetic abrasive finishing method is used to remove the oxide film on the inner surface of the 304 stainless steel tube. The variation law of magnetic field intensity and lapping pressure in the processing area is explored by designing magnetic pole heads with different taper and combined with simulation. Finally, the finishing test is compared with simulation. The results show that with the increase of the taper of the magnetic pole head, the magnetic field strength increases first and then decreases, and the lapping pressure increases first and then decreases under the influence of magnetic field strength. When the taper of the magnetic pole head is 80°, the magnetic field strength is the strongest and the lapping pressure is the largest. After finishing, the inner surface roughness of the pipe fitting is changed from the original Ra 3.06 μm down to Ra 0.23 μm. The maximum height difference of the surface is changed from the original 47.4 μm down to 19.6 μm. The oxide film on the inner surface is removed, showing uniform lapping marks. The force simulation of magnetic abrasive particle movement and finishing test show that the machining with 80 ° profiling magnetic pole head can effectively improve the inner surface quality of 304 stainless steel pipe. |
| Key words: profiling magnetic pole head magnetic abrasive finishing alternating magnetic field lapping pressure 304 stainless steel pipe surface quality |
