(1. 西北工業(yè)大學(xué) 凝固技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室，西安 710072；
2. 中國(guó)重型機(jī)械研究院有限公司，西安 710032)
摘 要: 基于開發(fā)的AZ31鎂合金薄壁管分流擠壓精確、高效的DEFORM−3D有限元模型，模擬揭示分流孔軸向傾角β對(duì)擠壓力、焊合壓力及模口處坯料金屬流速均勻性的影響規(guī)律，并對(duì)β進(jìn)行優(yōu)化設(shè)計(jì)。綜合考慮擠壓力、材料利用率、焊縫焊合質(zhì)量、管材尺寸精度及其應(yīng)用環(huán)境等因素，獲得該規(guī)格AZ31鎂合金薄壁管分流擠壓模具的合理分流孔軸向傾角取值范圍為−5°~1°，最優(yōu)分流孔軸向傾角為β≈ −5°(即內(nèi)斜5°)。
關(guān)鍵字: AZ31鎂合金；薄壁管；分流組合模；分流孔軸向傾角；數(shù)值模擬
（1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China;
2. China National Heavy Machinery Research Institute Co., Ltd., Xi’an 710032, China）
Abstract:Based on the developed precise and efficient DEFORM−3D model of the porthole extrusion process for the thin-walled AZ31 Mg alloy thin-walled tube, the influence laws of porthole axial angle β on the extrusion load, welding pressure and the uniformity of billet flow rate at the die export were investigated and revealed by the comprehensive numerical simulations, and the value of β was optimized. In integrated consideration of the extrusion load, the material utilization rate, quality of welding area and profiles size accuracy, and taking the tube application environment into account, it is proposed that the optimum β is −5°−1°, the most suitable value of β is about −5° for the AZ31 Mg alloy thin-walled tube profile die.
Key words: AZ31 Mg alloy; thin-walled tube; porthole die; porthole axial angle; numerical simulation
