锻压技术

带攻牙和滑块折弯的连接板级进模具结构设计

英文标题：Structural design on progressive die for connecting plate with tapping and slider bending

作者：刘碧云

分类号：TG385

出版年,卷(期):页码：2024,49(11):149-154

摘要：

对连接板的结构和冲压工艺进行了分析，针对产品上的翻边螺纹孔，为了提高攻牙的效率，提出在级进模具上安装攻牙机构，利用上模的上、下运动，驱动攻牙机构中的丝锥旋转，对产品上的翻边螺纹孔进行攻牙，省去运用攻牙机器单独对翻边螺纹孔进行攻牙的工序。由于翻边螺纹孔内径较小，同时为了延长翻边凸模的寿命，将翻边凸模的端部设计为椭圆尖形。针对其中一组折弯特征根部的加强筋与翻边螺纹孔几乎在同一竖直线上的结构，为了防止折弯后回弹，设计了滑块折弯机构；为了克服回弹现象，采用预折弯和折弯的冲压工艺；为了防止冲压加强筋时影响孔的形状，将其中1个冲孔工序安排在冲压加强筋工序后进行。

The structure of connecting plate and its stamping process were analyzed, and for the flanging threaded hole, in order to improve the efficiency of tapping, a tapping mechanism was installed on the progressive die. Then, the screw tap in the tapping mechanism was driven to rotate by utilizing the upward and downward movements of upper die, and the flanging threaded hole on the product was tapped, eliminating the separate tapping process for the flanging threaded holes by tapping machine. Furthermore, due to the small inner diameter of the flanging threaded hole, and in order to prolong the life of flanging punch, the end of flanging punch was designed with an elliptical pointed shape. For the structure where the reinforcing ribs at the bending feature root were almost on the same vertical line as the flanging threaded holes, and in order to prevent the springback after bending, a slider bending mechanism was designed. Finally, in order to overcome the springback phenomenon, the stamping process of pre-bending and bending was adopted. In addition, in order to prevent the hole shape from being affected during the stamping process of reinforcing ribs, one of the punching process was arranged after the stamping process of reinforcing ribs.

基金项目：

作者简介：刘碧云（1974-），女，硕士，正高级讲师 E-mail：261756927@qq.com

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