锻压技术

板材充液热成形工艺成形极限预测研究

英文标题：Prediction on forming limit in hot/warm sheet hydroforming process

分类号：

出版年,卷(期):页码：2016,41(4):36-41

摘要：

为了对充液热成形工艺下的金属板材成形极限进行预测研究，采用长轴直径为Φ100 mm，短轴直径分别为Φ100，Φ90，Φ80，Φ60和Φ40 mm的椭圆形胀形模具，在4个不同温度梯度为300 ℃,210 ℃,150 ℃和RT（常温），两个不同压力率0.0045和0.045 MPa·s-1条件下进行铝合金板材热态胀形试验。利用相关极限应变计算公式，对试验数据进行计算和整理，标绘出了试验材料拉-拉变形区的成形极限曲线。结合二次多项式曲线拟合方法，计算出了拟合函数中的材料常数，建立了可用于预测金属材料成形极限、标绘材料成形极限曲线（拉-拉变形区）、指导金属板材热态胀形试验的板材成形极限预测模型方程。

In order to predict the forming limit in warm/hot sheet hydroforming, the warm/hot sheet hydrobulging test of aluminum alloy sheets were carried out by elliptic bulging die with the long shaft diameter Φ100 mm, short axis diameters Φ100，Φ90，Φ80，Φ60和Φ40 mm respectively under the conditions of four different temperatures at 300, 210, 150 ℃, RT (room temperature) and two different pressure rates at 0.0045, 0.045 MPa·s-1. The experimental data were calculated and collated, and the forming limit curves (FLCS) in tensile-tensile stress deformation zone were obtained by the correlation formula of ultimate strain. Combined with the quadratic polynomial curve fitting method, material constants of fitting function were calculated, and a prediction model equation was established to predict metal forming limits, plot forming limit curves (in tensile-tensile stress deformation zone), and give a guidance to warm/hot sheet metal hydrobulging test.

基金项目：

国家重大基础研究项目（613152-06）

蔡高参（1985-），男，博士，工程师

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