陈晓明,徐成宇,季冬锋,刘宁,朱永伟.基于混合粒径的TC4钛合金低粗糙度磁力研磨研究[J].表面技术,2023,52(12):112-118, 159.
CHEN Xiao-ming,XU Cheng-yu,JI Dong-feng,LIU Ning,ZHU Yong-wei.Research on Low Roughness Magnetic Grinding of TC4 Titanium Alloy Based on Mixed Particle Size[J].Surface Technology,2023,52(12):112-118, 159 |
| 基于混合粒径的TC4钛合金低粗糙度磁力研磨研究 |
| Research on Low Roughness Magnetic Grinding of TC4 Titanium Alloy Based on Mixed Particle Size |
| 投稿时间：2023-09-28 修订日期：2023-11-07 |
| DOI：10.16490/j.cnki.issn.1001-3660.2023.12.010 |
| 中文关键词: 混合粒径 磁力研磨 表面粗糙度 磁力链 |
| 英文关键词:mixed particle size magnetic abrasive finishing surface roughness magnetic chain |
| 基金项目: |
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| Author | Institution |
| CHEN Xiao-ming | College of Mechanical & Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;Jiangsu Maritime Institute, Nanjing 211100, China |
| XU Cheng-yu | College of Mechanical & Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China |
| JI Dong-feng | College of Mechanical & Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China |
| LIU Ning | College of Mechanical & Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China |
| ZHU Yong-wei | College of Mechanical & Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China |
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| 中文摘要: |
| 目的 获得更低粗糙度的TC4 钛合金零件表面。方法 采用黏结法制备不同粒径的磁性磨料，依次运用粒径为150~250 μm和63~106 μm的磁性磨粒以及这两种粒径的混合磨料进行磁力研磨对比实验，分析基于混合粒径的TC4钛合金低粗糙度磁力研磨可行性。基于磁性颗粒动力模型，根据最小能量原理分析了混合粒径磁力链的微结构，并利用体式显微镜对单粒径和混合粒径磁力链进行对比分析。结果 单粒径和混合粒径磁力研磨在12 min时钛合金工件表面粗糙度均约为0.11 μm，此时单一粒径趋于平衡，而混合粒径磁力研磨的表面粗糙度继续下降，在16 min左右达到最低，为0.084 μm，比单一粒径降低了20%，工件表面初始划痕和凹坑得到了更好的去除，加工后表面纹理更为致密。大粒径磁力链颗粒能量最小，约为‒3.6×10‒13 J，其次是混合粒径磁力链结构，颗粒能量约为‒2.1×10‒13 J，而小粒径磁力链结构颗粒能量约为‒0.45×10‒13 J，是大粒径和混合粒径磁力链的5~9倍，这说明小粒径颗粒不易形成单独磁力链。结论 混合粒径磁力链中，小粒径颗粒不易形成单独磁力链，而是吸附在大粒径磁力链间隙中，提高了磁力刷的刚性和密度，不同粒径的磨粒同时参与研磨，从而在混合粒径磁力研磨TC4钛合金中能够有效的降低表面粗糙度。 |
| 英文摘要: |
| To obtain a lower roughness surface of TC4 titanium alloy parts, magnetic abrasives with different particle sizes were prepared by the bonding method in this paper. Abrasives with particle sizes of 150-250 μm, 63-106 μm, and mixed abrasives of both sizes were successively used for magnetic abrasive finishing (MAF) comparison experiments, and the feasibility of low roughness MAF of TC4 titanium alloy based on mixed-size abrasives (MSA) was analyzed. Based on the dynamic model of magnetic abrasives, the microstructure of the magnetic chains in MSA was analyzed by the minimum energy principle, and the magnetic chains of single-size abrasives (SSA) and MSA were compared by the stereomicroscope. Results showed that the surface roughness Ra of the titanium alloy workpiece processed by SSA and MSA was both about 0.11 μm at 12 minutes, but it would continue to decrease in the MSA finishing. The lowest roughness Ra in MSA finishing was 0.084 μm at 16 minutes, which was 20% lower than that of SSA finishing. The initial scratches and pits on the workpiece surface were better removed and the surface texture was denser after MSA finishing. In the observation experiment, it was found that the magnetic chain formed by the single-size particles had more bifurcations and voids, which were relatively loose, while the bifurcations and voids of the magnetic chain formed by the mixed-size particles were significantly reduced, and the combination was closer with the decrease of the particle size ratio. Besides, the particle energy of the magnetic chain formed by large-size particles was the smallest, which was about ‒3.6×10‒13 J, and then followed by mixed particle size magnetic chain structure with particle energy of approximately ‒2.1×10‒13 J. According to the principle of minimum energy, the smaller the energy is, the more stable the structure is. The magnetic chain structure of small-size particles with particle energy of approximately ‒0.45×10‒13 was hard to form, because the particle energy in the small-size magnetic chain was 5-9 times higher than that in the large-size and mixed-size. Obviously, the single-chain and double-chain structures formed by large-size particles were the most stable, and then followed by the double-chain formed by mixed-size particles. In the SSA, due to the large grinding pressure and diamond particles, the scratches on the workpiece surface were prominent in the MAF with large-size particles. Furthermore, it was difficult to obtain a lower surface roughness in the MAF with small-size particles attributed to its low grinding pressure and weak cutting ability. In the MSA, the small-size particles did not form a separate magnetic chain but were adsorbed in the gap of the large-size magnetic chains, which contributed to the rigidity and density of the magnetic brush. The large particle size abrasives had a strong cutting ability, and the small particle size abrasives helped to eliminate the scratches generated by the large particle size abrasives. Due to the synergistic processing of the different abrasive sizes, the surface roughness of the TC4 titanium alloy was significantly improved. |
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