锻压技术

加载工况对弹性模成形过程中轻合金薄板成形性的影响

英文标题：Influence of loading conditions on formability of light alloy sheet in elastic die forming process

单位：1.华中科技大学材料科学与工程学院材料成形与模具技术国家重点实验室 2.一汽模具制造有限公司 3.武汉华工激光工程有限责任公司 4.山东大学材料科学与工程学院 5.北京机电研究所有限公司 6. 广东汇成真空科技股份有限公司

分类号：TG311

出版年,卷(期):页码：2022,47(12):56-67

摘要：

为了分析柔性传力介质提升板材成形性的机理，开展了不同加载工况下轻质合金薄板的弹性模胀形实验，通过数字图像相关技术获取了板材构型和应变分布，采用有限元软件ANSYS/LS-DYNA分析了弹性模压力场和板材应力场。结合实验与有限元结果，研究了弹性模邵尔硬度、板材材质、板材厚度、界面摩擦等因素对轻合金板材成形性的影响规律。结果表明：随着弹性模邵尔硬度、板材屈服强度、板材厚度的增大，成形载荷逐渐增大；板材厚度越大，则成形性越好；板料屈服强度的增大会导致板材的均匀塑性变形能力降低；随着弹性模邵尔硬度降低，板材的径向应力减小，应力状态由近似单轴应力状态向等双拉状态变化，板材的充型能力增强。

In order to analyze the mechanism of flexible force-transmitting medium improving sheet formability, the elastic die bulging experiments of light alloy sheet under different loading conditions were carried out, and the configuration and strain distribution of sheet were obtained by using digital image correlation technology. Then, the pressure field of elastic die and stress field of sheet were analyzed by finite element software ANSYS/LS-DYNA, and the influence laws of Shore hardness of elastic die, sheet material, sheet thickness and interfacial friction on formability of light alloy sheet were studied by combining experimental and finite element simulation results. The results show that with the increasing of Shore hardness of elastic die, yield strength and thickness of sheet, the forming load increases gradually. The thicker the sheet is, the better the formability is. However, the increasing of yield strength of sheet reduces the uniform plastic deformation of sheet. With the decreasing of Shore hardness of elastic die, the radial stress of sheet decreases, the stress state changes from uniaxial stress state to nearly equally-biaxial tension state, and the filling capacity of sheet increases.

基金项目：

国家自然科学基金资助项目（51905156，52275329）；中国博士后科学基金资助项目（2020M672221）

许东方（2001-），男，硕士研究生 E-mail：dongfang_0922@163.com 通信作者：相楠（1987-），男，博士，副教授 E-mail：xiangnan-87@163.com

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