7075鋁合金擠製成型之模擬驗證分析

SIMULATION VERIFICATION ANALSIS of 7075 ALUMINUM ALLOY EXTRUSION FORMING

何明雄(Ming-Hsiung Ho) ； 李平惠(Pin-Hui Lee) ； 張惠敏(Hui-Min Chang)

《南亞學報》 42期 (2022/12) Pp. 18-30

摘要

本研究以參考文獻為基準，使用DEFORM 3D有限元素軟體模擬空心7075鋁合金材擠壓製程，以評估及比對DEFORM 3D模擬結果與文獻結果之擠壓力、公模、母模應力。首先建立7075鋁合金方管擠製參數及擠製模型，其中公、母模材質為SKD-61。採用擠壓速度為0.5 mm/s，擠製溫度為480℃，並採用無熱傳導模式進行分析。分析結果顯示DEFORM 3D軟體模擬分析之最大擠壓力為712噸，參考文獻分析結果之最大擠壓力為711噸，兩者擠壓力趨勢相同。在擠製過程發現焊合行程慢3 mm的距離，其原因是公模行程和焊合室高度的落差造成，但對擠壓力沒有造成影響。在應力分析方面，以公模之參考點做比較，A點應力比文獻參考小16%，B點應力比文獻參考大8%，其差異是分析網格數及節點位置選用的差異所造成。在母模應力分析方面，其結果比文獻小0.4%，在模具與製程參數相當下，分析結果與文獻相近，顯示本研究分析程序合理可行性。

關鍵字

擠製成型 ； 模擬分析 ； 鋁合金 ； 模具設計

並列摘要

In this study, based on the reference literature, DEFORM 3D finite element software was used to simulate the extrusion process of hollow 7075 aluminum alloy to evaluate and compare the extrusion force, male die, and female die stress between the DEFORM 3D simulation results and the literature results. Firstly, the extrusion parameters and extrusion model of 7075 aluminum alloy square tube are established, and the material of male and female molds is SKD-61. The analysis was performed using an extrusion speed of 0.5 mm/s, an extrusion temperature of 480°C, and the processes in adiabatic mode. The analysis results show that the maximum extrusion force of the DEFORM 3D software simulation analysis is 712 tons, and the maximum extrusion force of the reference analysis results is 711 tons, both of which have the same extrusion force trend. In terms of stress analysis, compared with the reference point of the male model, the stress at point A is 16% smaller than that in the literature reference, and the stress at point B is 8% larger than that in the literature reference. The difference is caused by the difference in the number of analysis grids and the selection of node positions. In terms of the stress analysis of the master mold, the result is 0.4% smaller than that of the literature. The results showed that the analysis procedure of this study is reasonable and feasible.

並列關鍵字

Extrusion ； Simulation Analysis ； 7075 Aluminum Alloy ； Die Design