(北京有色金屬研究總院 有色金屬材料制備加工國家重點實驗室，北京100088)
摘 要: 在Simufact9.0軟件平臺上，采用基于Euler網(wǎng)格描述的有限體積法，對蝶形模具非穩(wěn)態(tài)擠壓過程進行數(shù)值模擬，并與傳統(tǒng)模具進行對比。數(shù)值模擬結果表明：當采用蝶形模具擠壓方型管材時，金屬的流動及變形較傳統(tǒng)模具擠壓時的更加均勻，分流橋上端及焊合室的死區(qū)減小；擠壓力曲線平穩(wěn)，沒有明顯的突變，突破分流孔的擠壓力較傳統(tǒng)模的降低約72.2%，最大擠壓力降低約17.3%；模具的等效應力分布更加均勻，最大等效應力降低約11.2%，模具的使用壽命提高，且分流橋的彈性變形減小，模芯的穩(wěn)定性提高。
關鍵字: 蝶形模具；鋁型材；有限體積法；數(shù)值模擬
（State Key Laboratory of Nonferrous Metals and Processes,
General Research Institute for Non-ferrous Metals, Beijing 100088, China）
Abstract:Based on Simufact9.0 commercial software the non-steady state extrusion process of butterfly die was investigated using finite volume method (FVM) of Euler mesh description and compared with the traditional porthole die extrusion. The simulation results show that when the square tube profile is extruded using the butterfly die, the metal flow and deformation are more homogeneous than those of the traditional die, and the dead metal zone at the top of dividing bridge and welding chamber decreases. Furthermore, the extrusion load curve is smoother and there is no obvious mutation change. The breaking portholes load and the maximum extrusion load of the butterfly die are reduced by 72.2% and 17.3%, respectively. The effective stress distribution is more uniform, and the maximum effective stress is reduced by 11.2%，which improves the die operating life. Moreover, the elastic deformation of the dividing bridge is lowered, and the stability of the die core is improved.
Key words: butterfly die; aluminium profiles; finite volume method (FVM); numerical simulation
