Study on surface quality and tool wear of TiAl alloy in ultrasonic longitudinal torsion assisted milling
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摘要: TiAl合金属于典型难加工材料，采用传统方式加工难以获得良好的表面质量，因此文章提出采用超声纵扭辅助铣削TiAl合金。试验采用单因素对照方法，研究了超声纵扭铣削（ULTM）与普通铣削（CM）加工TiAl合金时工艺参数对表面粗糙度、表面形貌及显微硬度的影响规律。研究结果表明，ULTM铣削可以改善TiAl合金的表面粗糙度，获得普遍较低的粗糙度值（Ra<0.6 μm）；ULTM对TiAl合金表面硬化具有强化作用，能使表面硬度平均提升超过10%，并且采用ULTM加工得到的工件和切屑表面质量都较好。此外，铣削150 mm3的TiAl合金时发现ULTM的刀具底刃磨损量明显减小，刀具主要发生氧化磨损和扩散磨损。Abstract: TiAl alloy is a typical challenging material to process, and standard machining is difficult to achieve acceptable surface quality. As a result, this research proposes ultrasonic longitudinal torsion aided milling. Using a single factor control experiment, it was determined how the machining parameters affected the surface roughness, surface morphology, and microhardness of TiAl alloy during ultrasonic longitudinal twist milling and conventional milling. The outcomes demonstrate that TiAl alloy surface roughness may be improved using ultrasonic longitudinal torsional milling, leading to typically low roughness (Ra<0.6 μm). The TiAl alloy’s surface hardness may often be increased by more than 10% thanks to ULTM. The workpiece and chip obtained by ULTM have improved surface quality. The tool bottom edge wear of ULTM is greatly decreased while milling 150 mm3 TiAl alloy, and the primary wear types are oxidation wear and diffusion wear.
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Key words:
- TiAl alloy /
- ultrasonic torsional milling /
- surface quality /
- tool wear
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表 1 TiAl合金的材料性能
温度 25 800 屈服强度/MPa 440 380 抗拉强度/MPa 540 500 弹性模量/GPa 172 151 导热系数/ （m· ℃） 21 23.1 延伸率/ （%） 1.5 6 
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表 2 铣削参数表
切削速度
vc/（m/min）每齿进给量
fz/（mm/z）切削深度
ap/mm超声频率
f/kHz30,40,50,
60,700.01 0.1 0 70 0.01,0.015,0.02,
0.025,0.030.1 0 70 0.01 0.1,0.15,0.2,
0.25,0.30 70 0.01 0.1 0 70 0.01 0.1 31.25,31.5,31.75,
32,32.25
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