不同冷却条件下钛铝合金切削加工材料去除机理和加工表面完整性

doi:10.7527/S1000-6893.2023.29471

Abstract

Abstract:

Titanium aluminum alloy has such advantages as low density， high strength， good high-temperature creep resistance and oxidation resistance， and has broad application prospects in the aerospace industry. However， due to the poor thermal conductivity， severe work hardening， and low-temperature brittleness of the material， the high cutting temperature during the cutting processing leads to low machining efficiency， low tool life， and poor surface integrity， which limits the application promotion of this material. this paper Focusing on the problem of high cutting temperature of titanium aluminum alloy， and based on its temperature sensitive mechanical properties， this paper investigates the mechanical properties， material removal mechanism， and surface integrity of titanium aluminum alloy Ti-48Al-2Cr-2Nb material. The dynamic failure behavior and fracture mechanism of the material at different temperatures are studied through Hopkinson impact shear tests. The chip morphology and morphology evolution under different cooling conditions and cutting parameters are simulated through finite element simulation. Face turning experiments are conducted under three different cooling environments， and the changing rule of surface roughness is analyzed. Combining the fracture mechanism of the material and the fracture form of the lamellar structure， the formation mechanisms of micro pits and microcracks are revealed. The degree of work hardening and the depth of the hardened layer are analyzed by combining cutting force and cutting temperature， revealing the changing rule of hardness.

Key words: cooling conditions, cutting temperature, titanium aluminum alloy, surface integrity, material removal mechanism

CLC Number:

V261.2

Xiangyu WANG, Jinhui WANG, Wenhao QIU, Jintao NIU, Xiuli FU, Yang QIAO. Material removal mechanism and surface integrity of cutting titanium aluminum alloy under different cooling conditions[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(13): 629471.

Figures/Tables 36

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References 27

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冷却条件	干切削	乳化液冷却	液氮冷却
摩擦系数	0.6	0.4	0.2
初始温度/℃	20	20	-196

参数	数值
进给量/（mm·r^-1）	0.1
切削速度/（m·min^-1）	60/90/120/150/180
切宽/mm	2
冷却条件	干切削，乳化液冷却切削，液氮冷却切削
喷嘴直径/mm	3

参数	数值
进给量/（mm·r^-1）	0.1
切削速度/（m·min^-1）	60/90/120/150/180/210
切削深度/mm	0.2
冷却条件	干切削，乳化液冷却切削，液氮冷却切削
喷嘴直径/mm	3

切削速度/（m·min^-1）	冷却条件
切削速度/（m·min^-1）	干切削	乳化液冷却切削	液氮冷却切削
60
90
120
150
180

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Material removal mechanism and surface integrity of cutting titanium aluminum alloy under different cooling conditions

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