苏永生,李亮,钟相强.激光选区熔化钛合金超声辅助铣削性能研究[J].表面技术,2022,51(10):321-327.
SU Yong-sheng,LI Liang,ZHONG Xiang-qiang.Machining Performance of Ultrasonic Assisted Milling of Titanium Alloy Fabricated by Laser Selective Melting[J].Surface Technology,2022,51(10):321-327
激光选区熔化钛合金超声辅助铣削性能研究
Machining Performance of Ultrasonic Assisted Milling of Titanium Alloy Fabricated by Laser Selective Melting
  
DOI:10.16490/j.cnki.issn.1001-3660.2022.10.034
中文关键词:  激光选区熔化钛合金  聚晶金刚石刀具  超声辅助  表面质量  切屑黏结
英文关键词:laser-selective melting titanium alloy  polycrystalline diamond tools  ultrasonic vibration assisted milling  surface quality  chip adhesion
基金项目:安徽省重点研究与开发计划项目(2022a05020006);高校优秀拔尖人才培育资助项目(gxgnfx2019013);安徽工程大学中青年拔尖人才培养计划;基于SLM的新材料制备及打印工艺开发(2020ybxm03);安徽工程大学-鸠江区产业协同创新专项基金项目(2021cyxtb10)
作者单位
苏永生 安徽工程大学 机械工程学院,安徽 芜湖 241000 
李亮 南京航空航天大学 机电学院,南京210016 
钟相强 安徽工程大学 机械工程学院,安徽 芜湖 241000 
AuthorInstitution
SU Yong-sheng School of Mechanical Engineering, Anhui Polytechnic University, Anhui Wuhu 241000, China 
LI Liang College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics &Astronautics, Nanjing 210016, China 
ZHONG Xiang-qiang School of Mechanical Engineering, Anhui Polytechnic University, Anhui Wuhu 241000, China 
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中文摘要:
      目的 针对激光选区熔化钛合金开展超声振动辅助铣削性能和作用机理研究,提高增材制造钛合金表面加工质量、加工精度及加工效率,推动增材制造钛合金构件在高端装备业领域的广泛应用。方法 在传统铣削和超声振动辅助铣削下,采用聚晶金刚石刀具开展激光选区熔化钛合金铣削试验研究,分析不同条件下的表面硬度、切削力、表面形貌、表面粗糙度和切屑黏结的差异性。结果 激光选区熔化钛合金硬度单次测量及其平均值均高于传统钛合金。常规干铣削激光选区熔化钛合金时,切削力随着转速的增大而呈现下降趋势,随着进给速度和切削深度的增加表现出逐渐增大的趋势。在传统铣削下,传统钛合金表面形貌存在明显的刀具划痕,而超声振动铣削时,激光选区熔化钛合金表面形貌总体表现出更加的光滑和平整。激光选区熔化钛合金在常规铣削和超声辅助铣削过程中,刀具前后刀面都出现了严重的钛合金切屑黏结现象。结论 激光选区熔化钛合金常规干铣削时,增大转速或降低进给速度和切削深度能够降低切削力。在相同切削参数下,激光选区熔化钛合金超声铣削质量优于传统钛合金常规铣削表面质量。激光选区熔化钛合金表面质量改善的作用机理主要归因于激光选区熔化钛合金的金相组织特性及超声振动时断续切削特性的综合效应。相对于传统铣削方式,超声振动辅助铣削对改善激光选区熔化钛合金加工过程中的刀具抗黏结性效果有限。
英文摘要:
      The work aims to study performance and mechanism of action of ultrasonic vibration assisted milling of laser-selective melting titanium alloy, to improve the surface machining quality, machining accuracy and machining efficiency of additive manufacturing titanium alloy, and to promote the extensive application of additive manufacturing titanium alloy components in high-end equipment industry. Methods of conventional milling and ultrasonic vibration assisted milling were employed in milling of laser-selective melting titanium alloy by using polycrystalline diamond tools, and the differences of surface hardness, cutting force, surface morphology, surface roughness and chip adhesion were analyzed under different conditions. The surface hardness of laser-selective melting titanium alloy is higher than that of conventional titanium alloy by single measurement value and its average value. During the process of dry milling of the laser-selective melting titanium alloy using conventional milling way, the cutting forces decreased with the increase of rotational speed, and they increased with the increase of feed speed and cutting depth. Under the condition of conventional milling, there were some obvious tool scratches on the surface morphology of the conventional titanium alloy. However, more smooth and flat surface morphology of laser-selective melting titanium alloy were successfully achieved under the method of ultrasonic vibration assisted milling. In addition, it was found that there were serious chip adhesion on the surface of rake face and flank face using the conventional titanium alloy or the ultrasonic vibration assisted milling. Cutting forces can be reduced by the methods of increasing rotation speed, decreasing feed speed and cutting depth in conventional dry milling of the laser-selective melting titanium alloy. In addition, the experiments indicate that the machining quality of the laser-selective melting titanium alloy using ultrasonic vibration assisted milling is is better than that of the conventional titanium alloy. Compared with the machined quality of conventional milling of the conventional titanium alloy, the better surface quality of the laser-selective melting titanium alloy can be obtained by using the ultrasonic vibration assisted milling under the same cutting parameters. The action mechanism in improving surface quality of laser-selective melting titanium alloy is mainly attributed to several aspects. On one hand, the fine microstructure and higher hardness of laser-selective melting titanium alloy leads to its higher brittleness and lower plastic flow. On the other hand, compared with conventional milling way, the discontinuous cutting characteristics of ultrasonic vibration machining, which can contribute to increasing the tool-workpiece separation time and decreasing the actual cutting time, thus further improving chip breaking, reducing cutting friction of tool-workpiece or tool-chip and surface roughness of machined workpiece. The results demonstrates that the ultrasound-assisted milling has hardly effect in improving the chip adhesion on the tool surface. This may be caused by a combination of factors including the characteristics of strong adhesion and plastic fluidity of the laser-selective melting titanium alloy, the low friction coefficient of polycrystalline diamond cutter and the small brittleness difference between the laser-selective melting titanium alloy and the traditional titanium alloy.
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