With the characteristics of real-time synchronization

loyal mapping and high-fidelity

digital twin is considered as an important means to realize the interconnection between the physical and information world. In the present work

the state of art and applications of digital twin theory are discussed in detail. Additionally

the paper analyses the progress on digital twin modelling and application in the micro milling of titanium alloy parts

in terms of micro milling technique process

cutting tool status

milling quality and microscale machining equipment. Finally

the essential issues that should be solved in the study of micro milling digital twin modeling

are presented according to the analysis of digital twin application. The establishment of a digital twin simulation model integrating machine

cutting tool and workpiece has important theoretical significance and practical value

which is able to expand application scope of digital twin

improve the efficiency of micro milling

and promote the development of intelligent manufacturing technology.