7XXX系鋁合金HFQ溫成形界面換熱系數(shù)實驗研究

7XXX系鋁合金HFQ溫成形界面換熱系數(shù)實驗研究Experimental study of interfacial heat transfer coefficient for 7XXX series aluminum alloy in HFQ warm forming

基于自主設(shè)計的圓臺模具淬火實驗平臺，研究高強度7075-T6鋁合金在HFQ溫成形過程中的瞬態(tài)傳熱規(guī)律。通過Beck非線性估算法(Beck反算法)獲得界面換熱系數(shù)(IHTC)在不同因素下(包括合模壓強與表面粗糙度)隨溫度變化的瞬態(tài)換熱規(guī)律，并分析各因素對IHTC的影響機理。結(jié)果表明：Beck反算法在計算瞬態(tài)換熱系數(shù)時具有較高的計算精度。7075-T6鋁合金與模具界面的瞬態(tài)換熱系數(shù)隨壓強增大而增大，當壓強增大到80 MPa時，瞬態(tài)平均換熱系數(shù)IHTC趨近于3375 W/(m2？K)。進一步，表面粗糙度也會影響7075-T6鋁合金溫成形過程的IHTC，當粗糙度大于0.57 μm并小于0.836 μm時，IHTC隨粗糙度的增大而明顯減小，當粗糙度小于0.57 μm或大于0.836 μm時，IHTC值均隨粗糙度的增大而緩慢減小。

Based on self-developed cylindrical-die experimental model, transient heat transfer law of high-strength 7075-T6 aluminum alloy in HFQ warm forming was investigated in this paper. Beck’s non-linear estimation method (Beck’s method) was used to calculate IHTC under different processing factors, including different closure pressure and surface roughness. The results showed that Beck’s method has a high accuracy in calculating IHTC; The transient IHTC of 7075-T6 aluminum increases with the increases of closure pressure, and when pressure is above 80 MPa, IHTC approaches to 3375 W/(m2？K). Furthermore, surface roughness can also affect IHTC, when surface roughness is between 0.57 μm and 0.836 μm, IHTC decreases obviously with the increase of surface roughness, and when surface roughness is larger than 0.836 μm or less than 0.57 μm, IHTC decreases slowly with the increase of roughness.

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