施凯博,孙玉利,余泽,李国华,左敦稳.钛合金磨料流光整加工表面完整性研究[J].表面技术,2019,48(10):80-85.
SHI Kai-bo,SUN Yu-li,YU Ze,LI Guo-hua,ZUO Dun-wen.Study on the Surface Integrity of Titanium Alloy in Abrasive Flow Machining[J].Surface Technology,2019,48(10):80-85 |
| 钛合金磨料流光整加工表面完整性研究 |
| Study on the Surface Integrity of Titanium Alloy in Abrasive Flow Machining |
| 投稿时间：2019-07-19 修订日期：2019-10-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.10.009 |
| 中文关键词: 钛合金 格栅 磨料流光整加工 表面完整性 表面粗糙度 残余应力 显微硬度 |
| 英文关键词:titanium alloy grille abrasive flow machining surface integrity surface roughness residual stress microhardness |
| 基金项目:校企合作项目（KFA17978-01）；南京航空航天大学研究生创新基地（实验室）开放基金项目（kfjj20170507） |
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| Author | Institution |
| SHI Kai-bo | 1.College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China |
| SUN Yu-li | 1.College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China |
| YU Ze | 2. AVIC Chengdu Aircraft Industrial (Group) Co., Ltd, Chengdu 610000, China |
| LI Guo-hua | 2. AVIC Chengdu Aircraft Industrial (Group) Co., Ltd, Chengdu 610000, China |
| ZUO Dun-wen | 1.College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China |
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| 中文摘要: |
| 目的 研究磨料流光整加工钛合金格栅表面完整性。方法 用电火花加工制备钛合金试样，通过磨料粒径、加工压力、加工次数的单因素试验，来研究其对试样表面粗糙度和表面形貌的影响规律，选用三种初始粗糙度不同的钛合金试样来进行磨料流光整加工效果试验，对比分析磨料流光整加工对试样表面残余应力的影响，进行加工次数的单因素试验研究磨料流加工过程中其对工件表面显微硬度的影响。结果 对于钛合金试样来说，磨料粒径和加工压力越大，表面抛光效果越明显，表面粗糙度就越低。当磨料粒径从38 μm增加到420 μm时，相对应的表面粗糙度值Ra从5.815 μm降低到0.824 μm；当加工压力从8 MPa增加到24 MPa时，相对应的表面粗糙度值Ra从4.314 μm降低到1.398 μm。而随着加工次数的增加，表面粗糙度值Ra从整体上呈现下降趋势，最后趋于稳定，当加工次数从10增加到80时，相对应的表面粗糙度值Ra从5.925 μm降低到0.307 μm，并且最后稳定在0.300 μm附近。钛合金试样经磨料流光整加工之后，表面残余应力由原来的拉应力变成了压应力。随着加工次数的增加，钛合金试样表面显微硬度整体上呈现先减小后增大的趋势，当加工次数从10增加到50时，显微硬度值从532.83HV降到357.73HV，当加工次数从50增加到90时，显微硬度值从357.73HV上升到393.48HV，试样表面显微硬度的均匀性也显著增加。结论 增大磨料粒径和加工压力或者增加加工次数，都能降低工件表面粗糙度，钛合金工件经过磨料流光整加工之后，表面完整性有较大改善。 |
| 英文摘要: |
| The work aims to study the surface integrity of the titanium alloy grid in abrasive flow machining. The titanium alloy samples were prepared by electric discharge machining. Based on single factor experiments, the effects of abrasive grain size, machining pressure and machining times on the surface roughness and surface morphology were discussed. Three kinds of samples with different initial surface roughness were selected to analyse the surface residual stress before and after abrasive flow machining. The single factor experiments were carried out to study the effect of machining times on the surface microhardness of samples. For titanium alloy samples, the larger the abrasive grain size and processing pressure, the more obvious surface polishing effect and the lower the surface roughness. When the abrasive grain size increases from 38 μm to 420 μm, the corresponding surface roughness value Ra decreases from 5.815 μm to 0.824 μm. And when the machining pressure increases from 8 MPa to 24 MPa, the corresponding surface roughness value Ra decreases from 4.314 μm to 1.398 μm. With the increase of machining times, the surface roughness shows a downward trend as a whole, and finally tends to be stable. When the machining times increases from 10 to 80, the corresponding surface roughness value Ra decreases from 5.925 μm to 0.307 μm, and finally stabilizes at about 0.300 μm. After abrasive flow machining, the surface residual stress of titanium alloy changed from tensile stress to compressive stress. With the increase of machining times, the surface microhardness of titanium alloy decreased at first and then increased, and the uniformity of surface microhardness increased significantly. When the machining times increases from 10 to 50, the microhardness value decreases from 532.83HV to 357.73HV. And when the machining times increases from 50 to 90, the microhardness value increases from 357.73HV to 393.48HV. It shows that increasing abrasive grain size, machining pressure and machining times can reduce surface roughness. The surface integrity of titanium alloy workpiece is greatly improved after abrasive flow machining. |
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