The paper analyses the structure of tube blank and the every link making inner folds such as puring and heating processing,parameter select of perforation,tools for changing the shape.

• 文章从坯料的组织分析入手,对有可能对内折产生影响的各个环节如圆坯的浇铸、加热、穿孔参数的选择、变形工具的形状等各个方面进行了分析。