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介绍了用作图解析法确定不等高圆孔翻边和椭圆孔翻过时预冲孔形状及尺寸的通用计算公式与一般作图步骤。利用该作图解析法确定不等高内孔翻边时的预冲孔形状及尺寸,不仅可省略翻边后再冲切工件口部的工序,提高生产效率及翻边成形质量,而且对其他形状的不等高内孔翻边件的成形加工,也具有积极的启发和指导作用。
A general calculation formula and a general drawing procedure for determining the shapes and sizes of pre-punched holes with unequal height of round flange and oval hole when turning over are introduced. Using the method of drawing analysis to determine the shape and size of the pre-punched hole when the inner hole flanging is not equal, not only can the process of blanking the workpiece mouth after the flanging be omitted, the production efficiency and the quality of the burring can be improved, Unequal shape of the hole flanging pieces of the forming process, but also has a positive inspiration and guidance.