• CN：11-2187/TH
• ISSN：0577-6686

• 制造工艺与装备 •

### 高速铣削钛合金Ti-6Al-4V切屑形态试验研究

1. 1.中北大学机械与动力工程学院
2.太原理工大学机械工程学院
• 出版日期:2015-02-05 发布日期:2015-02-05
• 基金资助:
国家自然科学基金(51275490)、山西省回国留学人员科研(2013-086)和中北大学校基金资助项目

### Experimental Study on the Chip Morpholgy in High Speed Milling Ti-6Al-4V Alloy

LIU Lijuan1, 2 Lü Ming2 WU Wenge 1 ZHU Xijing1

1. 1.School of Mechanical and Power Engineering, North University of China
2.School of Mechanical Engineering,Taiyuan University of Technology
• Online:2015-02-05 Published:2015-02-05

Abstract: The microstructure of chips in high-speed milling is analyzed, and the relationship between the cutting factors, chip formation, cutting force and surface roughness is established. It is found that the higher cutting speed is the less time heat spreads, the more heat in the shear zone gathers, the higher the possibility of occurrence of dynamic recrystallization in shear zone gets. A large amount of heat promotes the thermoplastic instability within the shear zone, the frequencies of the adiabatic shear band and the degree of serrated chip increase. The temperature and the cooling rate in adiabatic shear band are calculated, and it is found that deformation time is much lower than the cooling time. It is proved that dynamic recrystallization phenomenon occurs in high speed milling. The modeling of new developed J-C constitutive model which considers recrystallization softening effect is built; it has two expressions according to the different characteristics of material constitutive during critical strain values. Theoretical calculations proved that the developed J-C constitutive is more suitable than J-C constitutive.