管材内高压成形工艺研究

Research on Internal High Pressure Forming Process of Tube

阐述了管材内高压成形基础理论,给出内高压成形区间和加载曲线之间的关系。结果表明:合理的弯曲工艺能控制外侧过度减薄和内侧起皱,避免了弯曲部位过度减薄引起内高压成形过程中的开裂。采用典型截面二维数值模拟和整体零件三维数值模拟相结合的方法,保证零件贴模度良好,安全裕度较高。通过内高压成形工艺开发出某副车架管梁,检测表明产品尺寸及型面均满足设计要求,现已批量化生产。

Fundamental theories of tube internal high pressure forming （IHPF） were expounded,and the relationship between IHPF interval and the loading curve was given. The results show that： reasonable bending process can control the excessive outside thinning and inside wrinkling, and the fracture caused by the excessive thinning at the workpiece during IHPF is avoided. Using the method combining the 2D simulation of typical sections with 3D the simulation of the whole part ensures the good sticking die degrees of the part and higher safe margin. A sub-frame beam was developed successfully by internal high pressure forming. The measure indicates that the dimensions and the surface of the products meet the design requirements. These products have been mass production.