(1. 長沙學(xué)院 機電工程系，長沙 410003； 2. 湖南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410082)
摘 要: 為優(yōu)化楔壓變形的工藝參數(shù)，采用Deform-3D有限元軟件對噴射沉積5A06鋁合金楔壓變形進行了數(shù)值模擬。壓頭壓下速度為0.1~10 mm/s，變形溫度為350~550 ℃。結(jié)果表明：壓下速度越大，坯料的平均密度和變形抗力越高，楔壓表面質(zhì)量越好，不容易產(chǎn)生臺階，但所需的壓力機噸位也越大。變形溫度對坯料的致密沒有明顯的影響，然而溫度太低容易在壓制過程產(chǎn)生裂紋，而溫度過高時坯料表面容易出現(xiàn)畸變，并且組織會發(fā)生過燒。因此，噴射沉積5A06鋁合金楔壓變形的最佳工藝參數(shù)為：壓頭壓下速度1.0 mm/s，變形溫度為450 ℃。
關(guān)鍵字: 5A06鋁合金；噴射沉積；楔壓；數(shù)值模擬
（1. Department of Mechanical and Electrical Engineering, Changsha University, Changsha 410003, China; 2. College of Materials Science and Engineering, Hunan University, Changsha 410082, China）
Abstract:In order to optimize the processing parameter, the sequential motion compacting of spray deposited 5A06 alloy was simulated by using rigid-plastic finite element method (FEM) on DEFORM-3D software. During the sequential motion compacting, the depressed velocity of head is 0.1−10 mm/s, the range of deformation temperature is 350−550 ℃. The results show that with increasing depressed velocity, the average density of preform and resistance of deformation become higher, the surface quality becomes better and there are no steps on the surface, but the press tonnage also becomes higher. Although the effect of deformation temperature on densification of preform is obscure, when the temperature is too low, the cracks occur easily, and when the temperature is too high, the aberration appears easily on the surface, the overburning microstructure can be found at the meantime. Thus, the optimal processing parameters of sequential motion compaction for spray deposited 5A06 alloy are: depressed velocity of head of 1.0 mm/s, deformation temperature of 450 ℃.
Key words: 5A06 alloy; spray deposition; sequential motion compacting; numerical simulation
