Abstract: Three types of modeling and simulation technology in digital manufacturing are analyzed, I.e. product modeling and simulation technology, process modeling and simulation technology, manufacturing system modeling and simulation technology. Based on some research projects, digital product modeling technology oriented to manufacturing, numerical control pipe bend process modeling and simulation technology, virtual assembly and assembly process simulation technology, production line modeling and simulation technology are discussed emphatically. A conclusion is pointed out that process modeling and simulation technology, including product’s machining process, assembly process, production system planning, reorganization and simulation technology is very important to improve manufacturing system’s efficiency and reliability, realize the optimization of production resource and machining process, transfer mode from traditional manufacturing to foreseeable manufacturing. At last, some key techniques which enhance digital modeling and simulation technology’s practicability are listed.

Key words: Process modeling, Digital manufacturing, Full semantic product model, Virtual assembly Production line simulation