應用Pam-Stamp於鋁合金成型之回彈分析

Springback Analysis of Aluminum Alloy Forming by Pam-Stamp

10.6989/JN.201112.0147

張志毅(Chih-Yi Chang)；林義凱(Yi-Kai Lin)；何明雄(Ming-Hsiung Ho)；沈炳臣(Ping-Chen Shen)

鋁合金成型 ； 回彈 ； U形彎曲 ； Aluminum alloy forming ； Springback ； U-shape bending

南亞學報

31期（2011 / 12 / 01）

147 - 160

繁體中文

鋁合金的沖壓成型元件已經普遍存在於生活周遭的各種器物中，例如筆記型電腦的螢幕背板、行動電話與數位相機的外殼...等3C產品，某些高強度鋁合金甚至應用於汽車的鈑件中，但是這些鋁合金沖壓成型元件普遍存在著回彈的問題，為了避免沖壓成型回彈的效應而導致大幅修改模具，利用有限元素法模擬成型與回彈成為必備的分析工具。影響回彈的因素非常多，包括平板材料性質、模具圓角、模具間隙、摩擦係數、壓板施力...等等，但本文將著重於探討軟體內部的影響因素，例如：殼元素厚度方向積分點數目、沖壓速度、平板在模具圓角處的元素數目、回彈演算法與分析精度等，許多分析軟體都將這些變因以預設值處理，因此常忽略這些變因對模擬結果的影響。本文將以NUMISHEET'93的鋁合金平板U形彎曲模型進行成型回彈分析，探討上述各種變因對回彈結果的影響。

The products of aluminum alloy by sheet metal forming are very popular in our daily life, such as the back plate of the laptop computer, the case of mobile phone and digital camera. Some high strength aluminum alloy even use in the body panels of the cars. The springback effects are widely existed in these aluminum forming products. For the reason to reduce the modification of mold components due to springback effects, the simulation and analysis of the sheet springback effects are very important.Accurate prediction of sheet metal forming is very difficult because the factors to influence the springback effects are numerous. Material properties, the radius of the molds, the gaps of the molds, the coefficients of friction, the forces applied on the blank holders, can change the final results. In this research, we focus on the internal factors induced by the software, such as the number of integration points in thickness direction of shell elements, the stamping velocity, the number of elements in contact with the die radius, the algorithm for the springback stage, the precision of computation. Researchers usually ignored the influences of these factors because most software proceeding these factors by default values. This research considered the U-shape bending models of NUMISHEET'93 to simulate and analyze the springback effects by Pam-Stamp.

1. 許鈞凱(2017)。以基礎載具分析先進高強度鋼板扭曲現象之研究。國立臺灣大學機械工程學系學位論文。2017。1-97。