Aiming at the requirement of real-time visualization of the assembly digital twin model of product

a visualization model simplification method oriented to the assembly process was proposed. Firstly

the AAG (Attributed adjacency graph) of the model was established by using the B–Rep information

the automatic recognition of features was realized through the graph matching of the basic feature AAG

and the assembly semantics were analyzed to extract the assembly feature information of current assembly process; Then

the improved QEM algorithm was used to optimize the error of edge collapse

which realized the adaptive adjustment of local simplification rate of the model and met the need of real-time visualization. Finally

the effectiveness of the method was verified by taking the assembly of a certain type of engine casing as an example.