In order to enhance the dimension precision of bent part, advanced bending technologies is requested recently. Rotary stretch bending(RSB) is a suitable technology to realize high precision of bent part. The effect of...In order to enhance the dimension precision of bent part, advanced bending technologies is requested recently. Rotary stretch bending(RSB) is a suitable technology to realize high precision of bent part. The effect of processing parameters, namely the side pressure and the stretching force, on the dimension precision of aluminium profile RSB part was studied by finite element method. The numerical simulation of the U-shaped aluminium profile RSB was carried out, and the validity of the simulation was checked. Parametric analysis shows that the section distortion of the U-shaped profile LY12M bent part decreases with the increasing of the side pressure, whereas the springback of curvature increases, and that both of the section distortion and the springback of curvature decrease with the increasing of the stretching force, moreover, the uniformity of curvature of the bent part is clearly enhanced with the increasing of the stretching force. The results above prove that RSB technology can better improve the dimension precision of aluminium profile bent part.展开更多
采用Schafer B W教授提出的直接强度法研究薄壁铝合金轴压构件承载力计算问题,并给出实用的建议设计公式。根据铝合金构件的特性指出采用有效截面理论计算薄壁铝合金轴压构件承载力时存在复杂截面难以计算、计算必须迭代和无法分析构件...采用Schafer B W教授提出的直接强度法研究薄壁铝合金轴压构件承载力计算问题,并给出实用的建议设计公式。根据铝合金构件的特性指出采用有效截面理论计算薄壁铝合金轴压构件承载力时存在复杂截面难以计算、计算必须迭代和无法分析构件畸变屈曲的缺陷,分析薄壁铝合金轴压构件的屈曲模式,给出各种屈曲模式下适合铝合金构件的屈曲荷载的计算方法。提出基于直接强度法的薄壁铝合金轴压构件承载力计算公式。利用试验数据和经试验数据验证的有限元计算结果与提出的建议计算公式的计算结果比对,验证了建议公式的正确性。此外,对照Eindhoven大学的铝合金槽形截面构件轴压试验数据,与现行欧洲铝合金规范计算结果比对,证明比现行欧洲铝合金规范计算公式更合理。展开更多
基金Project(2005CB724100) supported by the National Basic Research Program of ChinaProject(50605043) supported by the National Natural Science Foundation of China
文摘In order to enhance the dimension precision of bent part, advanced bending technologies is requested recently. Rotary stretch bending(RSB) is a suitable technology to realize high precision of bent part. The effect of processing parameters, namely the side pressure and the stretching force, on the dimension precision of aluminium profile RSB part was studied by finite element method. The numerical simulation of the U-shaped aluminium profile RSB was carried out, and the validity of the simulation was checked. Parametric analysis shows that the section distortion of the U-shaped profile LY12M bent part decreases with the increasing of the side pressure, whereas the springback of curvature increases, and that both of the section distortion and the springback of curvature decrease with the increasing of the stretching force, moreover, the uniformity of curvature of the bent part is clearly enhanced with the increasing of the stretching force. The results above prove that RSB technology can better improve the dimension precision of aluminium profile bent part.
文摘采用Schafer B W教授提出的直接强度法研究薄壁铝合金轴压构件承载力计算问题,并给出实用的建议设计公式。根据铝合金构件的特性指出采用有效截面理论计算薄壁铝合金轴压构件承载力时存在复杂截面难以计算、计算必须迭代和无法分析构件畸变屈曲的缺陷,分析薄壁铝合金轴压构件的屈曲模式,给出各种屈曲模式下适合铝合金构件的屈曲荷载的计算方法。提出基于直接强度法的薄壁铝合金轴压构件承载力计算公式。利用试验数据和经试验数据验证的有限元计算结果与提出的建议计算公式的计算结果比对,验证了建议公式的正确性。此外,对照Eindhoven大学的铝合金槽形截面构件轴压试验数据,与现行欧洲铝合金规范计算结果比对,证明比现行欧洲铝合金规范计算公式更合理。
