Study of Extension for Forming Limit of Sheet Metal at High Temperature

金属板材高温成形极限扩展研究

• 批准号: 03650551
• 负责人: SUZUKI Hideo
• 金额: $ 1.41万
• 依托单位: University of Electro-Communications
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03650551/
• 关键词: sheet forming; bulging; high temperature liquid; salt bath liquid; forming limit; FEM; 液体バルジ; 高温変形; 加工性拡大

A prototype bulging machine which was used at high temperature salt bath liquid as pressure substance was made. The efforts for temperature of the liquid, materials and thicknesses of the sheet metal were experimentally examined for the pressure of the liquid, the forming limit, the bulging profiles and the strain distribution. The bulging mechanism could become clear by numerical simulation using finite element method. The temperature of is changed from 200ﾟC to 450ﾟC. The pressure of liquid, the height of bulging and strain distribution were measured at various temperature of the liquid. As the temperature of liquid was higher, the pressure decreases. The pressure value at 450ﾟC became 10% of the value at room temperature. When the bulge height is equal to 20mm, the bulge profiles and distribution made little difference at various temperatures. As the bulging height were higher, the deformation was caused at the vicinity of the bulging top. The bulging limit could be extended by the bulging method.

制作了高温盐浴液体时使用的原型膨胀机作为压力物质。实验检查了液体，材料和厚度的温度的努力，以实验检查液体的压力，形成极限，凸起剖面和应变分布。使用有限元方法的数值模拟可以清楚地清楚膨胀机制。温度从200°C变为450 ﾟC。液体的压力，在液体的各种温度下测量隆起和应变分布的高度。随着液体的温度较高，压力降低。在450°C时的压力值在室温下变成了值的10％。当凸起高度等于20mm时，在各种温度下，凸起的轮廓和分布几乎没有差异。随着凸起的高度较高，变形是在凸起顶部附近引起的。膨胀极限可以通过膨胀方法扩展。